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Old 08-19-2018, 11:31 AM   #29
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2007 27' International CCD FB
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I'm in the midst of fabricating my receiver as well. This is a perfect relevant thread.

I'm taking a different strategy, which is to mount a receiver tube underneath the airstream bumper.

A few reasons:
1) Don't want to change the aesthetic of the AS.
2) The under bumper receiver allow me the use of various bike racks and to be nestle the rack itself as close to the rear bumper as possible to minimize overhung leverage/weight. Note the series of multiple hitch pin holes for that reason.
3) The mount is closer within the core of the AS frame to minimize loads on the far tail. It will be bolted to two internal frame spanners of the AS, such that torsion loads are mitigated.

Here's a few pics of progress this morning.

36" undermount hitch receiver. I have the farthest end bracket tacked on at the moment. Also note the addition of a anti-wobble nut at the bottom right.
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Here's a pic of the furthest rear cross frame member behind the bumper. This is where most of the load will be. It'll be reinforced by sistering two right angle extrusions on each side, you can see the one on the outside. What you can't see is the additional screws I've added between the shell and frame. These screws are behind the rub strip to secure against any potential separation.
Click image for larger version

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Old 08-19-2018, 07:22 PM   #30
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Testing the initial fit-up.

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Boondocking option package:
'07 27FB Ocean Breeze "See Turtle", 3" lift
'09 Lexus LX570, on 33's
Tongue Mount Honda eu2200i - Rear Hitch - Underbelly Storage - Blizzard NXT w/ EasyStart - 3" Lift - 6" Fan Controller
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Old 08-19-2018, 08:01 PM   #31
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Quote:
Originally Posted by pteck View Post
Testing the initial fit-up.



Attachment 320346


Nice! That’s a very similiar approach I was initial going to take. This is great, I’ll be going with this approach. Thanks for posting.
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Old 08-20-2018, 09:45 AM   #32
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Adding a little more tongue weight to equal the weight of the rack and bikes will offset that weight. It ain't rocket science. If you are worried about sway from something as minimal as this then you need a bigger truck. That photo of the flipped Airstream had an SUV type car pulling it. That right there is proof enough for me that you need more truck and less weight distribution/sway devices to TRY to improve towing safety.
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Old 08-20-2018, 10:06 AM   #33
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Originally Posted by tbashin View Post
Adding a little more tongue weight to equal the weight of the rack and bikes will offset that weight. It ain't rocket science. If you are worried about sway from something as minimal as this then you need a bigger truck. That photo of the flipped Airstream had an SUV type car pulling it. That right there is proof enough for me that you need more truck and less weight distribution/sway devices to TRY to improve towing safety.
To your point, I am mounting an EU2200i to the tongue of my Airstream. That 50lbs there should easily restore any potential change in COG to the trailer. Additionally, there's ample of opportunity for me to loadout my airstream with more bags/weight in the forward bedroom of my 27FB.

I don't necessarily agree with a bigger truck to compensate if one's tow vehicle meets the capacity requirements . A trailer should be inherently stable within itself by having the correct percentage of tongue weight. While a large truck is nice for more payload and capacity if one needs it, using a larger truck as compensation for a badly setup trailer is buying false confidence. It can and will sway just the same.
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Boondocking option package:
'07 27FB Ocean Breeze "See Turtle", 3" lift
'09 Lexus LX570, on 33's
Tongue Mount Honda eu2200i - Rear Hitch - Underbelly Storage - Blizzard NXT w/ EasyStart - 3" Lift - 6" Fan Controller
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Old 08-20-2018, 11:00 AM   #34
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Quote:
Originally Posted by jhumphreys View Post
. . .
Justin Humphreys here again.
. . .
COO- Airstream, Inc.
Thank you, Justin, for participating in that other thread. Any chance you could have Airstream reply in this thread about the company's feelings on folks adding rear-mounted hitches, bike racks, and storage boxes?

I had always assumed that AS's approval of the Fiamma bike rack, as the only approved one, also meant that nothing else heavier should be mounted further aft.

This debate has gone on for years, and a clear statement from Airstream would settle the issue, as well as promote safety for Airstream owners, their families, and the motoring public.

Thanks,

Peter

PS -- CC to AirstreamInc -- thanks.

Quote:
Originally Posted by AirstreamInc View Post
. . .
We look forward to helping you get this resolved.
. . .
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Old 08-20-2018, 02:10 PM   #35
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Originally Posted by OTRA15 View Post
Thank you, Justin, for participating in that other thread. Any chance you could have Airstream reply in this thread about the company's feelings on folks adding rear-mounted hitches, bike racks, and storage boxes?

I had always assumed that AS's approval of the Fiamma bike rack, as the only approved one, also meant that nothing else heavier should be mounted further aft.

This debate has gone on for years, and a clear statement from Airstream would settle the issue, as well as promote safety for Airstream owners, their families, and the motoring public.

Thanks,

Peter

PS -- CC to AirstreamInc -- thanks.


If his comments are related to an un-modified trailer it may be helpful.

However, if the AS has been restored each will be different and his comments would not apply to all.

For example, the OP and I have added a significant amount of additional strength to the frame or other have rebuilt their frames to be stronger.

Additionally, how the weight is distributed throughout the trailer would impact it.

To make a general statement one way or the other that applies to all is just ineffective and inaccurate.
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Old 08-20-2018, 02:25 PM   #36
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Structural problems with Airstreams are caused when the attach points between the frame and shell break down. There are a few bolts and thin aluminum sheet metal holding these things together and that is at the front and back. The shell holds up the frame and if you put too much weight on the frame, it pulls loose from the shell. Also adding weight to the rear has a negative impact on stability. See this link.





Perry
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Old 08-20-2018, 03:38 PM   #37
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Originally Posted by tabney0315 View Post
If his comments are related to an un-modified trailer it may be helpful.
. . .
That was implicit in the question IMO.
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Old 08-20-2018, 09:39 PM   #38
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Quote:
Originally Posted by perryg114 View Post
Structural problems with Airstreams are caused when the attach points between the frame and shell break down. There are a few bolts and thin aluminum sheet metal holding these things together and that is at the front and back. The shell holds up the frame and if you put too much weight on the frame, it pulls loose from the shell. Also adding weight to the rear has a negative impact on stability. See this link.





Perry
Love that video. It's incredibly useful to see and is eye opening for the uninitiated. Especially people new to towing that don't properly load out the trailer and avoid tongue weight.

If you'll note in the demonstration, they take the red weight off the nose of the trailer. The takeaway is not necessarily "don't remove weight from the front of the trailer."

Inasmuch as the takeaway is not necessarily "adding weight to the rear [having] a negative impact on stability".

The big picture here is that proper weight distribution is key to maintaining trailer stability. Even if only loading gear within the confines of the shell. It should always be considered. To your point, moreso when adding a rack onto the rear of the trailer.
__________________
Boondocking option package:
'07 27FB Ocean Breeze "See Turtle", 3" lift
'09 Lexus LX570, on 33's
Tongue Mount Honda eu2200i - Rear Hitch - Underbelly Storage - Blizzard NXT w/ EasyStart - 3" Lift - 6" Fan Controller
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Old 08-20-2018, 10:05 PM   #39
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Lots more progress today. Most of the job is complete, including fabrication, fitup, and welding. Here's what it looks like.

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On the trailer frame, all structural additions are bolted on. The additions are 2x steel angle extrusions that run the full width, sandwiching the C-channel cross member, and ends at the main frame rails. One on the forward side of the rear cross member (can't see). One on the rear side (the one you can see) just above the hitch. I could have welded which requires more access, but I preferred the bolt through approach.

The angle brackets create structural ledges that the receiver can bolt to from beneath:
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There's 4 main load bearing bolts closest to the receiver end for stability. The hitch extends to the next cross member which will bear minimal weight, but will account for the torsion loads. A weight distributing hitch if you will.

Undermount receiver:
Click image for larger version

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This is the component that brings it all together, that requires some fabrication equipment and skill. Fully welded up here and ready to go.

If one wanted to reproduce it, some metal from home depot, angle grinder, drill, and tape measure is all it takes. Then bring it all to a welding shop. I'm just a casual DIYer, that loves modding cars, and learns by doing. My day job doesn't let me have hands on kind of fun. But I do engineer things quite a bit more complicated than this. If anyone is looking for a specific pic before I button things up, let me know.
__________________
Boondocking option package:
'07 27FB Ocean Breeze "See Turtle", 3" lift
'09 Lexus LX570, on 33's
Tongue Mount Honda eu2200i - Rear Hitch - Underbelly Storage - Blizzard NXT w/ EasyStart - 3" Lift - 6" Fan Controller
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Old 08-21-2018, 12:14 AM   #40
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Link to 36" receiver tube if anyone is interested in reproducing. Other metal components can be found at home depot.

https://www.amazon.com/Curt-Manufact...ds=36%22+hitch
__________________
Boondocking option package:
'07 27FB Ocean Breeze "See Turtle", 3" lift
'09 Lexus LX570, on 33's
Tongue Mount Honda eu2200i - Rear Hitch - Underbelly Storage - Blizzard NXT w/ EasyStart - 3" Lift - 6" Fan Controller
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Old 08-21-2018, 12:45 PM   #41
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Anna Maria , Florida
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Quote:
Originally Posted by perryg114 View Post
Structural problems with Airstreams are caused when the attach points between the frame and shell break down. There are a few bolts and thin aluminum sheet metal holding these things together and that is at the front and back. The shell holds up the frame and if you put too much weight on the frame, it pulls loose from the shell. Also adding weight to the rear has a negative impact on stability. See this link.





Perry
So please tell me, what is the shell attached to above so it can hold up the frame?
Your post is utter nonsense. The frame is the foundation that holds everything and carries the entire assembly. Axles ,brakes wheels coupler that pulls the loaded weight of the trailer.
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Old 08-21-2018, 04:15 PM   #42
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Quote:
Originally Posted by pteck View Post
To your point, I am mounting an EU2200i to the tongue of my Airstream. That 50lbs there should easily restore any potential change in COG to the trailer. Additionally, there's ample of opportunity for me to loadout my airstream with more bags/weight in the forward bedroom of my 27FB.

I don't necessarily agree with a bigger truck to compensate if one's tow vehicle meets the capacity requirements . A trailer should be inherently stable within itself by having the correct percentage of tongue weight. While a large truck is nice for more payload and capacity if one needs it, using a larger truck as compensation for a badly setup trailer is buying false confidence. It can and will sway just the same.
Just what exactly do you mean by a " badly set up trailer " ?
In our case we simply fill up the fridge, the water tank and basic necessities in the cupboards and closets. I never get anywhere near full capacity of the trailer payload.
Hook up the Blue Ox and the truck and away we go. Been doing this for six years over three of those I have been also loading our to bikes onto the Sari bike rack mounted on to the frame in the back of the trailer .
I haven't done anything special to set up our trailer beyond installing the hitch and bike rack.
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