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Old 08-26-2015, 03:36 PM   #11
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The problem is the bumper . Not the welds . I almost lost my bikes had it not been for someone passing me and mouthing "bikes" and pointing to the rear of my camper. The weld held up just fine. The bumper tore like a piece of paper. Your best bet is mount a receiver to the frame .
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Old 08-26-2015, 05:41 PM   #12
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you could always buy one of the cargo/bike racks from a dealer that are installed at the factories on the rear of RV's and add it to yours. They are designed and built to be mounted on the rear, to take the abuse, bouncing, etc. that folks are mentioning here. They are heavy duty for that purpose. On a previous RV we had after the factory warranty expired I did just this. Beefed up my frame a little bit and purchased a rack through a dealer and added it. I carried bikes, generators and "stuff" with no issues. Just a thought for you to consider.
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Old 08-26-2015, 06:32 PM   #13
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But do I need to beef up mine anymore then it already is? I have two Beams welded to my bumper on each side. I get the feeling that most of the people who had issues where the welds break, etc, only had one beam welded to the bumper on each side. Mine looks to be already reinforced.
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Old 08-26-2015, 10:42 PM   #14
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your bumper looks to me like its pretty light weight metal like most are. Your brackets though look heavier. But Im not sure if your double frame lengths are long enough to accommodate the swivel brackets for the cargo/bike racks I mentioned earlier. My frame from the factory is a double frame also but sticks out much further than yours look. My rack does not use the bumper for any support at all. You would need to attach anything you ad to the frame brackets themselves and NOT to your bumper. If they are not long enough then I would look at adding a receiver hitch between the frame rails and under your bumper. and then find a rack that mounts into the receiver. Preferrably a 2".
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Old 08-27-2015, 12:27 AM   #15
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On my old 5th wheel the square tube ripped ; the welds were OK .
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Old 08-29-2015, 11:01 AM   #16
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Forest River put a spare tire and grill on my back bumper that weight 133 lbs that I removed to put my bike rack on. You say the bikes bounce to much -- get behind one that has that 40 lbs grill on the three piece swing arm bounce - About twice as much as bikes on rack. My bikes and rack weight 76 lbs and don't bounce near as much as the that 40 lbs grill did. The bike rack i got was the one from Camping World and they advertize it for use on RVs and even show pictures being mounted on RVs.

When I called FR about the issue the guy said that he couldn't tell me that it won't damage the bumper but several of the Forest River employees had one just like mine on their fiver bumper and hadn't caused any damage including one guy form development. LOL
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Old 09-07-2015, 10:06 AM   #17
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Quote:
Originally Posted by djm560 View Post
The problem is the bumper . Not the welds . I almost lost my bikes had it not been for someone passing me and mouthing "bikes" and pointing to the rear of my camper. The weld held up just fine. The bumper tore like a piece of paper. Your best bet is mount a receiver to the frame .
Exactly, and there lies the initial problem. "The wall thickness of the 4" tube bumper"

A bracket attached to this thin wall 4" tube must cover a considerable "area" to distribute the weight.
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Old 09-07-2015, 10:10 AM   #18
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Quote:
Originally Posted by ksting View Post
But do I need to beef up mine anymore then it already is? I have two Beams welded to my bumper on each side. I get the feeling that most of the people who had issues where the welds break, etc, only had one beam welded to the bumper on each side. Mine looks to be already reinforced.
your structural issue lies in the "thin wall thickness of the 4" tube". The tube wall is more likely to "tear" than a weld breaking.

Any bracket welded, or bolted needs to cover a considerable "area" to distribute the weight and stress.

I would suggest not less than 12" surface attachment, and this is for "bikes" only.
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Old 09-07-2015, 12:21 PM   #19
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Originally Posted by DavidAndDonna View Post
your structural issue lies in the "thin wall thickness of the 4" tube". The tube wall is more likely to "tear" than a weld breaking.

Any bracket welded, or bolted needs to cover a considerable "area" to distribute the weight and stress.

I would suggest not less than 12" surface attachment, and this is for "bikes" only.
So how do you explain the 133 lbs of weight that mine had on it from the factory with the same type bracket. Far as bouncing that 40 lbs grill with it's 30 lbs tri fold swing out mount bounces lot more then bikes on decent rack. The spare tire weights 68lbs....
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Old 09-07-2015, 12:59 PM   #20
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Originally Posted by CWSWine View Post
So how do you explain the 133 lbs of weight that mine had on it from the factory with the same type bracket. Far as bouncing that 40 lbs grill with it's 30 lbs tri fold swing out mount bounces lot more then bikes on decent rack. The spare tire weights 68lbs....
the first thing I would do as a professional fabricator is refer you to one in your local area for any mods. A professional can assist you.

An additional area to consider also is a brace or gusset on the rack it self.

Rest assured if I can build this bed with a B&W setup a bicycle rack is not an issue.

A professional fabricator can assist you.
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