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02-05-2016, 07:59 AM
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#1
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4 Rivet Member
1979 31' Excella 500
Charlevoix
, Michigan
Join Date: Aug 2014
Posts: 350
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Mercedes R320 CDI towing 31' '79 Excella
My family and I, we're... well, nontraditional. I work from "home", my wife is a musician, we get a high when we get rid of stuff, we're downsizing from a 6 bedroom house to a 31' Airstream. By my parent's accounts, we've got it all wrong, but that hasn't deterred us from living more simply, intentionally and adventurously.
This mentality extends to our tow-vehicle selection for our resto'modded '79 Excella. We knew that our Tow Vehicle would be our only vehicle and that whatever we got it'd be towing about 1/4 of the time and driving our family around without the AS 3/4 of the time. We wanted a vehicle that was optimized for family, but could also tow if properly equipped.
Turns out there's a vehicle out that fits the bill perfectly... The Mercedes R320 CDI!
On the family considerations side, it's a 3-row 6 passenger vehicle. Lots of room for the kiddos and dog.
On the towing side, it's an turbo diesel V6 that makes 400 ft-lb of torque! For reference, that's more than some 3/4 ton trucks out there. It's all-wheel drive, 7 speed manually shift-able (tap up/down) transmission, has a looooooong wheel base, looooooow center of gravity, wide stance, short rear overhang, built on a truck chasis, big brakes and stiff frame.
We're going to Andy at CanAm to get a weight distribution system installed and any other modifications needed.
We found a R320 for sale used near us (turns out they're pretty ratre, only 32 listed in the whole USA for sale on autotrader). It needed a little TLC (even a little TLC in the Mercedes world equates to big $$$) but we haven't looked back.
I plan to update this thread with our experience with this vehicle since I only found one other post that even mentions this model as a tow vehicle.
Oh, and some eye-candy of a R320 pulling a 34'' AS through Vermont (courtesy of Andy at CanAm)!
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02-05-2016, 10:39 AM
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#2
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Rivet Master
Currently Looking...
Walnut Creek
, California
Join Date: May 2015
Posts: 3,952
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Sounds like an interesting tow vehicle solution. With a long and low configuration, the designers may have got the right parameters pulled together. Will be interesting to see how your experiences play out. Safe travels. Pat
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02-05-2016, 01:54 PM
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#3
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Rivet Master
1984 34' International
Toronto
, Ontario
Join Date: Jul 2012
Posts: 1,499
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I've seen a bunch of those at WBCCI meetings in Ontario.
People who drove them really liked them, for all the reasons you gave above. It's not built on a truck chassis though, and doesn't have a frame either. Mercedes doesn't build passenger cars that way. It's a classic unibody with fully independent suspension all round.
I nearly bought one when we were looking for a van, but couldn't find one at the time.
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02-06-2016, 07:49 AM
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#4
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4 Rivet Member
1979 31' Excella 500
Charlevoix
, Michigan
Join Date: Aug 2014
Posts: 350
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Quote:
Originally Posted by andreasduess
It's not built on a truck chassis though, and doesn't have a frame either. Mercedes doesn't build passenger cars that way. It's a classic unibody with fully independent suspension all round.
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I thought I had read somewhere that it was built on a shared platform with a light-duty truck or SUV... Maybe I was mistaken? I can't seem to find any mention of that via Google now.
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02-06-2016, 09:48 PM
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#5
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Rivet Master
1984 34' International
Toronto
, Ontario
Join Date: Jul 2012
Posts: 1,499
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Quote:
Originally Posted by trekerboy
I thought I had read somewhere that it was built on a shared platform with a light-duty truck or SUV... Maybe I was mistaken? I can't seem to find any mention of that via Google now.
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It shares a platform with the Mercedes GL series, the Dodge Durango and the Jeep GC. All excellent tow vehicles, but none of them is body on frame.
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02-07-2016, 12:06 AM
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#6
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:SPACE A" S/O 11 Air19745
2006 34' Classic S/O
Fort Worth
, Texas
Join Date: Feb 2007
Posts: 1,766
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Be careful with hitching a uni-body. It must be done with welding and nut/bolts or... My first tow combination was a Rambler Ambassador (with uni-body) and a 3,600# Streamline 23' Duches. On the first RR track crossing the frame tore out of the un-body and the front cross bar almost snagged a rail. I barely made it back to the dealer who promptly fired his hitch shop.
guskmg
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02-07-2016, 10:25 AM
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#7
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Rivet Master
2012 23' FB International
Woodstock
, Ontario
Join Date: Aug 2014
Posts: 1,423
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If you are going to Andy at CAN AM then you can stop worrying about it. They will make it right regardless of the body construction. The paddle shift will make it a really good TV for hilly country.
JCW
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02-07-2016, 10:37 AM
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#8
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4 Rivet Member
1988 32' Excella
Ojai
, California
Join Date: Aug 2014
Posts: 275
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Unless they attach the reinforcement to a vibration mounted suspension carrier. Then you might want to worry.
__________________
Dave & MJ
1988 32' Excella 1000 (Beauty)
1999 White Dodge SLT Laramie 3500 Dually, 4x4, 5spd, 5.9 CTD 300k+ (The Beast)
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02-07-2016, 12:15 PM
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#9
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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Quote:
Originally Posted by Tuco
Unless they attach the reinforcement to a vibration mounted suspension carrier. Then you might want to worry.
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Wondering here why that might be worrisome. The reinforcing bar attaches to the suspension carrier so it's force is upward, same force on the suspension carrier when carrying the weight of the vehicle.
__________________
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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02-07-2016, 01:08 PM
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#10
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4 Rivet Member
1988 32' Excella
Ojai
, California
Join Date: Aug 2014
Posts: 275
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Any movement of the reinforcement arm will not be straight upward at the carrier due to deflection.
__________________
Dave & MJ
1988 32' Excella 1000 (Beauty)
1999 White Dodge SLT Laramie 3500 Dually, 4x4, 5spd, 5.9 CTD 300k+ (The Beast)
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02-07-2016, 02:59 PM
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#11
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Rivet Master
Currently Looking...
Walnut Creek
, California
Join Date: May 2015
Posts: 3,952
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Would not the force be downward if weight transfer to the front axles is in play? Pat
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02-07-2016, 03:22 PM
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#12
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4 Rivet Member
1988 32' Excella
Ojai
, California
Join Date: Aug 2014
Posts: 275
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Quote:
Originally Posted by PKI
Would not the force be downward if weight transfer to the front axles is in play? Pat
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Thank you for making me take a step back and look at the big picture again! So with WD in play the force applied on the carrier will be down and aft at some angle depending on load. At other times it will be forward and up again at some angle. It would be nice to know how often it is in each state, but it really doesn't matter. If all three sides of the triangle are not secure, you have no real reinforcement. It also puts undue wear on bushings that already have a short life. Thanks again Pat!
__________________
Dave & MJ
1988 32' Excella 1000 (Beauty)
1999 White Dodge SLT Laramie 3500 Dually, 4x4, 5spd, 5.9 CTD 300k+ (The Beast)
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02-07-2016, 03:37 PM
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#13
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3 Rivet Member
1989 32' Excella
Sharon Springs
, New York
Join Date: Jan 2016
Posts: 172
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Having never owned an M-B product, I can only recommend after owning GM uni-body products. I think that if you could find/fabricate a sub-frame connector for your vehicle, it might help safety/security-wise. That would "tie" your uni-body together and make it an even better tow vehicle. Just my thoughts, good luck and safe travels...
JDB
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02-07-2016, 04:16 PM
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#14
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Rivet Master
Vintage Kin Owner
N/A
, N/A
Join Date: Sep 2012
Posts: 989
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Welding a brace between the hitch and the axle carrier also causes you to bypass the rubber bushings and transmit road noise to the cabin.
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02-07-2016, 05:35 PM
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#15
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Rivet Master
1984 34' International
Toronto
, Ontario
Join Date: Jul 2012
Posts: 1,499
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CanAm welds a supporting beam forward to distribute the fulcrum force of the weight distribution hitch. Where that beam is welded to depends entirely on the vehicle in question.
On my Honda, there was zero increase in noise. When I showed the install to my mechanic (I am friendly with the owner of the dealership) he declared it "very clever, the way they did it".
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02-07-2016, 06:39 PM
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#16
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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Quote:
Originally Posted by PKI
Would not the force be downward if weight transfer to the front axles is in play? Pat
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Yes, downward or upward forces on the suspension carrier, the same forces the carrier is designed to operate with in a dynamic condition.
Has this even been an issue in the hundreds of vehicles with hitch reinforcement of this type, beyond the issues of normal bushing wear from suspension travel?
__________________
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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02-07-2016, 06:49 PM
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#17
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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Quote:
Originally Posted by rostam
Welding a brace between the hitch and the axle carrier also causes you to bypass the rubber bushings and transmit road noise to the cabin.
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Not sure what your point is. If the hitch connection produces road noise, then it is transmitted at the rear receiver connection. Honestly I've never heard any road noise difference hitched or unhitched.
But we should ask those with such a reinforcement; does this reinforcement produce more road noise?
__________________
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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02-07-2016, 07:07 PM
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#18
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Rivet Master
Vintage Kin Owner
N/A
, N/A
Join Date: Sep 2012
Posts: 989
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The axle carrier is not directly connected to the frame. The bushings lie between the frame and the axle carrier, preventing road noise getting to the cabin. If you weld a brace between the axle carrier and the hitch (which is connected to the frame), the road noise will be transmitted to the cabin via the brace, by passing the bushings.
Now back to the game.
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02-07-2016, 07:38 PM
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#19
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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It's not a game to the folks who actually tow Airstreams, there needs to be some basis in experience for this or it's simply fishing in a dry pond.
What is the noise transmission you suggest amount to, if any, from those who use this reinforcement?
That's what we need to know.
__________________
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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02-07-2016, 07:47 PM
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#20
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Rivet Master
Vintage Kin Owner
N/A
, N/A
Join Date: Sep 2012
Posts: 989
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Mercedes R320 CDI towing 31' '79 Excella
I was talking about the super bowl game
There is a master certified Porsche/Audi technician in the forum that posted about issues with the hitch reinforcement before.
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