Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-20-2006, 05:59 PM   #1
4 Rivet Member
 
Phil Gobie's Avatar
 
1977 31' Sovereign
Miami , Florida
Join Date: Nov 2006
Posts: 279
Hitch extension

I have a 1500 Avalanche TV. I will be towing a 30'AS. I want to take a motorcycle or scooters in the bed of the truck. They only fit with the gate down. I think I can work it out with only a 6" to 12" extension. Does any one have any experiance with this or simimilar set ups?
Thanks Phil
__________________

__________________
Phil Gobie is offline   Reply With Quote
Old 11-20-2006, 06:06 PM   #2
Rivet Master
 
RichardT's Avatar
 
Join Date: Sep 2003
Posts: 925
An extention will lower the weight rating of a hitch alot, check with the extention manufacturer for rating and allowable tounge weight. your trailer dry weighs about 4640 pounds with a tounge weight of 415, check it when loaded and make sure with the extention you will be within rated limits
Good luck.
__________________

__________________
RichardT is offline   Reply With Quote
Old 11-20-2006, 06:44 PM   #3
Rivet Master
 
TomW's Avatar
 
1967 26' Overlander
Huntsville , Alabama
Join Date: Dec 2003
Posts: 2,918
Images: 2
Thumbs up A new twist - Horizontal extension

Quote:
Originally Posted by Phil Gobie
... They only fit with the gate down. I think I can work it out with only a 6" to 12" extension...
That's a cool question that I never considered.

Since you have a relatively low tongue weight (compared to nowadays), if your weight distributing bars are equal to the task I think you could swing a horizontal extension which puts your Airstream further away from the tow vehicle.

The way I'm seeing it, proper weight distribution somewhat negates the distance the towed load is from the tow vehicle.

Of course I am open to other opinions. Anyone?

Tom
TomW is offline   Reply With Quote
Old 11-20-2006, 06:53 PM   #4
Retired Moderator
 
john hd's Avatar
 
1992 29' Excella
madison , Wisconsin
Join Date: Aug 2002
Posts: 4,644
Images: 40
will the bike/scooter fit if you lower the front gate on the avalanche?

i would try to stay away from an extension because of the added slop another connection could create.

perhaps a custom built longer drawbar could work.

john
__________________
you call them ferrets, i call them weasels.
john hd is offline   Reply With Quote
Old 11-20-2006, 07:18 PM   #5
Rivet Master
 
clancy_boy's Avatar
 
2003 22' International CCD
Kiln , Mississippi
Join Date: Dec 2005
Posts: 2,780
Images: 8
Look at the extension as a load extended out on a lever arm. Small changes in weight and distance can and will move mountains - ask the Egyptians. May not sound like much - 6" or 12" - but factor in the weights you are dealing with and the vehicle dynamics (road conditions, momentum, force in turns, etc...) and the end result could be dangerous for you and other vehicles involved.

The extensions I have seen were for bike racks and such - NOT TOWING AN AIRSTREAM. Having someone manufacture one only leads me to ask - if there is a market then why hasn't anyone else done it?

I say - don't do it. There are tail gate cable stops to allow you to open the tail gate partially without letting it down onto the jack.
__________________
Michael & Tina with Layla and Preston BZ
The family has grown.
2003 22' INTERNATIONAL CCD
clancy_boy is offline   Reply With Quote
Old 11-20-2006, 07:51 PM   #6
Rivet Master<br><img src="/ugala/forums/images/5rivet.gif">
 
CanoeStream's Avatar

 
2006 25' Safari FB SE
St. Cloud , Minnesota
Join Date: Aug 2003
Posts: 13,279
Images: 19
Blog Entries: 3
Clancy_boy would get my vote. Folks that have used the AirRide hitch have mentioned abandoning it due to the significant flexing brought on by the extra length.

A more serious issue comes with failures and GM hitch receivers breaking. Extra stress sure can't be good for them! You may need to look further than this link, but I have been seeing it mentioned occasionally this last year.
__________________
Bob

5 meter Langford Nahanni

CanoeStream is offline   Reply With Quote
Old 11-20-2006, 08:25 PM   #7
More than one rivet loose
 
thecatsandi's Avatar

 
Currently Looking...
Keymar , Maryland
Join Date: Feb 2006
Posts: 3,754
Can you mount a front hitch? Wally did. Carried a scooter.
I was considering it until Irolled my truck. No Motorcycle for me for a while.
__________________
Michelle TAC MT-0
Sarah, Snowball

Looking for a 1962 Flying Cloud

thecatsandi is offline   Reply With Quote
Old 11-20-2006, 08:33 PM   #8
Rivet Master
 
1977 31' Sovereign
1963 26' Overlander
1989 34' Excella
Johnsburg , Illinois
Join Date: Jul 2005
Posts: 2,941
Moving the pivot point of the tow package back 12 inches will increase the torque put on the unit when a truck passes. This will make the unit more likely to be pushed into a sway situation and cause a torque to try and push you off the road. I would not use it even if you put a antisway hitch on the rig.
__________________
dwightdi is offline   Reply With Quote
Old 11-20-2006, 10:37 PM   #9
Moderator Emeritus
 
overlander64's Avatar
 
1964 26' Overlander
1978 Argosy Minuet 6.0 Metre
Anna , Illinois
Join Date: Sep 2002
Posts: 5,396
Images: 183
Send a message via Yahoo to overlander64
Hitch extension

Greetings Phil!

I would be very cautious about considering a draw bar that moves the hitch head further from the rear axle of the tow vehicle. Even the modest extra length of the Reese drawbar that was designed to move the hitch head rearward far enough to permit the LP tanks to clear the rear mounted spare on my G2500 GMC Van when encountering tight turns created instability issues. When I upgraded to a full-size Jeep Grand Wagoneer, the instability went from a small concern to a large concern -- as the "twitching" became frequent. I couldn't believe that such a seemingly small amount of extra length could make that much difference; but when an experienced Reese hitch installer looked at my system, his first question was "Why are you towing with the drawbar designed for vans and SUVs with rear door mounted spares?" The difference was tremendous when the hitch was switched back to the normal drawbar.

The Jeep was later replaced by a K1500 Z71 Chevrolet pickup, and somehow I managed to get the old van's setup installed on the Z71, and it was even worse than the Jeep from the standpoint of instability -- again, switching back to the standard drawbar significantly improved the towing characteristics.

Good luck with your investigation!

Kevin
__________________
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
AIR #827
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)
overlander64 is offline   Reply With Quote
Old 11-20-2006, 10:53 PM   #10
Rivet Master
 
Fyrzowt's Avatar
 
2000 25' Safari
West of Fort Worth , Texas
Join Date: Aug 2006
Posts: 6,697
Images: 8
Quote:
Originally Posted by Phil Gobie
I have a 1500 Avalanche TV. I will be towing a 30'AS. I want to take a motorcycle or scooters in the bed of the truck. They only fit with the gate down. I think I can work it out with only a 6" to 12" extension. Does any one have any experiance with this or simimilar set ups?
Thanks Phil
I'm not familiar with the Avalanche tailgate set up. Is it like a regular pick-up? Could you simply remove it, or do you need the tailgate to support the bikes? Or as posted earlier, leave it partially open.
The consensus seems to be (and I agree) that you may be adding too much leverage with an extention. If you head that direction, make sure you research it thoroughly.
Dave
__________________
Fyrzowt is offline   Reply With Quote
Old 11-20-2006, 11:13 PM   #11
INSANITY CENTRAL
 
doorgunner's Avatar
 
1986 32' Excella
2014 Interstate Ext. Coach
Citrus Heights , California
Join Date: Aug 2006
Posts: 2,105
Images: 35
personal experience

Phil, I have a 86-32' excella about 7800 lbs, TV 93 -454- burb. 7 3/4" of my hitch bar is captured by the female receiver mounted to the truck. 14 1/2" from the reciever to the center of the ball. The receiver is rated for 10K weight distribution, I have an old Eaz-lift set up. round bars and chains. The hitchbar was extended to allow opening of the two rear doors of the burb while hooked to the AS. I have NO ILL handling at any time while pulling, NO SWAY, NO SUCKED IN BY SEMIS, NO CROSSWIND MOTION.NO BRAKING PROBLEMS NO PROBLEMS AT ALL!! This is working for me. True Story Tim
__________________


www.popasmoke.com




Proud Appellation American





Vine View Heights is now closed.

YETI ( 65 Quart )

IGLOO (Ice Cube, 50 Quart )
doorgunner is offline   Reply With Quote
Old 11-21-2006, 05:55 AM   #12
4 Rivet Member
 
Phil Gobie's Avatar
 
1977 31' Sovereign
Miami , Florida
Join Date: Nov 2006
Posts: 279
Thanks for the replys

In regards to the tailgate/bike I need the extra length to fit the bike. I can do it with the scooters but the motorcycles are too long. I am considering cutting a tailgate in half just for this set up. I was also thinking about cutting or removing the jack off and bringing a floor jack? I also thought that the Avalanche's very short bed puts the hitch closer to the axil and the effects my be less than other trucks with longer beds. As for the front hitch, I have not been able to find one that is made for the Avalanche. I had one made and I am having it strengthened and it will be fine for light loads like a light scooter, bikes and such.

Thanks for the replys, I have been reading other threads as well and there are a lot of considerations that would not have occured to me!
__________________
Phil Gobie is offline   Reply With Quote
Old 11-21-2006, 06:50 AM   #13
Rivet Master
 
1977 31' Sovereign
1963 26' Overlander
1989 34' Excella
Johnsburg , Illinois
Join Date: Jul 2005
Posts: 2,941
How much does the motocycle weight? You only have a 150 light duty truck. With the hitch weight of the Airstream added and also extended back further, you are really going to be putting alot of weight on the back wheels and lightening the load on the front steering wheels, unless you really overdo the Weight distribution weight shifting. Even with that, you are still overdoing the lateral loads and the 150 does not have very stiff sidwalls on the tires and the wheel base is not the best. Don't do, it unless you are only driving less than 50 mph on side roads with no trucks passing you.
__________________
dwightdi is offline   Reply With Quote
Old 11-21-2006, 07:06 AM   #14
Rivet Master
 
JimGolden's Avatar
 
Vintage Kin Owner
1977 31' Excella 500
Berkeley Springs , West Virginia
Join Date: Sep 2005
Posts: 1,619
Images: 7
The moment arm you care about could be taken two ways; either from the front axle, or the back axle.

Now that I think about it, you'd take it from the front axle and measure the reaction at the rear axles. So say the wheel base is 10 feet, and the hitch is 3' behind the back axle, and the hitch weight is 400lbs. You have a moment of (10+3 feet)*400lbs = 5200 ft-lbs. The vertical load on your back axle from this is then 5200 ft-lbs / 10 feet = 520 lbs.

OK, so you move it back a foot. Now your moment arm is 14 feet * 400 lbs = 5600 ft-lbs, and your vertical reaction at the back axle is 5600/10=560 lbs. So in the vertical plane it's basically nothing.

For stability, you'd have to do the same math but side to side. Your truck is supported at the front and back axles. It's basically like a big beam hooked at the front and trying to sweep the back around. You could also look at it as pivoted at the back axle and trying to sweep the front around. I'm not sure what the critical values are, but this is the basic math of it. Hope it helps a little
__________________

__________________
- Jim
JimGolden is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hitch height Chuck Hitches, Couplers & Balls 20 04-09-2016 11:21 PM
Hensley Arrow Hitch Les Hitches, Couplers & Balls 116 12-14-2015 08:41 AM
Hitch problem wyhjr Hitches, Couplers & Balls 8 07-22-2002 06:29 PM
Hitch inspections 83Excella Hitches, Couplers & Balls 3 07-09-2002 04:05 PM
Handy hitch step Pahaska Our Community 0 06-26-2002 06:44 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:40 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.