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Old 12-29-2014, 02:26 PM   #1
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Hanging motorcycle rack on rear bumper

Sure seems like a bad idea to me...
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Old 12-29-2014, 03:10 PM   #2
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Bad, BAD idea..
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Old 12-29-2014, 03:13 PM   #3
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I wouldn't do it... wayyyy too much weight
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Old 12-29-2014, 03:14 PM   #4
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I'm thinking the ad probably should have read "scooter rack", not motorcycle rack, but still a couple of scooters would still pack a fair bit of weight and the stress on the trailer frame would be a lot.

Epic bad idea.

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Old 12-29-2014, 03:36 PM   #5
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Might as well take a sledgehammer to the trailer right now and save yourself some time totally destroying the frame.

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Old 12-29-2014, 03:50 PM   #6
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Maybe the trailer needs to be totaled so the finance note can be retired.


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Old 12-30-2014, 07:39 AM   #7
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I've helped to take apart an Airstream for a "frame off" restoration. If people knew how these things were built, they would never hang anything off the back frame or bumper of an Airstream. They are simply not designed to take the load.
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Old 01-12-2015, 10:21 AM   #8
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Originally Posted by BambiTex View Post
Sure seems like a bad idea to me...
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Why is that a bad idea?
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Old 01-12-2015, 10:34 AM   #9
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Why is that a bad idea?
Potential stresses on the trailer frame may be more than the design allows. Reinforcement of the frame may be necessary.

Adding a small motorcycle/scooter to the back will reduce the hitch weight. Higher potential for sway if hitch weight < 10% of gross weight.
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Old 01-12-2015, 10:41 AM   #10
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The heavy weight behind the bumper can work like a pendulum hooked to your truck bumper, hard to stop any sway if it starts. Our Airstream Owners Manual warns against it.
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Old 01-12-2015, 10:54 AM   #11
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Why is that a bad idea?
Airstream frames are lightweight. Airstreams are constructed somewhat like an airplane, it's called "semi-monoque" which basically means that the ribs body and frame work together to support the weight of the Airstream. In SOB's they build a big honkin' frame that is the sole structural member - the walls and floor just rest on the frame. This "modification" has put a lot of weight on the very rear end of a weak frame. Unless the frame was totally replaced with a frame like an SOB, the frame is going to break somewhere between the axle and the motorcycle rack. Additionally the whole balance of the Airstream has been thrown off. Too little weight on the ball for starters and
then there is the dynamic weight. Now go down the road and hit a pothole and the weight on the far end of the frame does a whip crack and bounces like it weighs 900 lbs.

See post 20 in this thread - learn this term "polar moment of inertia" and what it means. The tail LITERALLY wags the dog! There was one full sized 15 passenger van which had the body extended, but not the wheelbase, so that six or more passengers were behind the axle. When going around a corner at speed the rear end got moving so fast relative to the axles that the van went over on it's side and spewed passengers out onto the road. I'm pretty sure that's been redesigned by now.

http://www.airforums.com/forums/f238...a-32704-2.html
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Old 01-12-2015, 11:26 PM   #12
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Interesting.
I reinforced my frame with 4" channel, from the axle back, distributing the weight and extending the stress/load points... I am quite certain (post #20, inclusive) most AS owners are going on experience (mostly of others) of the dreaded "tail/rear end sag", and other horror stories. I carry a Honda Trail 90 on my rear rack (mounts directly to each side of the frame, through the bumper) with ABSOLUTELY NO PROBLEM, What-so-ever...
I also have a weight distribution hitch with sway control, so maybe I'm just incredibly lucky? Or, maybe it's time for those who aren't 100% POSITIVE of the possibilities, options, and capabilities of these beauties to stop scaring others with hear-say?
Either way, I appreciate the forum for what it is and wish everyone a safe and happy AS experience.
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Old 01-13-2015, 12:01 AM   #13
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Mis-typed and couldn't edit after 30 minutes of posting...
Welded-in 3" x 1 1/2" square tube from axle to bumper.
(Hell, it may have been 4"x2", now I'm gonna have to measure because it's driving me crazy).
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Old 01-13-2015, 12:11 AM   #14
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