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I own a flyer. Like many transits, it's engine is mounted on/in a cradle which is bolted to the rear of the bus. I want to install a # 3 hitch and pull a trailer with car, but I'm afraid the system is not strong enough and will eventualy break, seperate or worst. I've seen other transit owners with similar designs affix a hitch to their rigs. But, I am still concerned that ultimately the 6 or 8 bolts that hold the entire rear end to the bus body could give way. I'm trying to locate someone who has pulled a rear end to get some idea of the exact size, thread number, material, shear specs of the bolts used to hold rear end. Any ideas from more experienced folks.
I have a GMC TDH-3610, I have a trailer hitch on my bus that I used to pull an 8,000lb tandem axle trailer from North Dakota to North Carolina. The hitch is made out of 3" angle iron, 3/8" thick. I used 3/8" stainless steel carriage bolts to attach it to the original bumper bracket attachment location. On my bus, with a monocoque frame, this worked very well.
With the trailer attached, Iscaled it and only had a 280lb raise in weight on the rear end. I checked the bolts after about 200 miles and there were no loose ones, and with the rubber cradle mounts carrying the pull weight, there wasn't much more play in the cradle. After 2000 miles, the cradle was in the same shape as when I started. If you are going to use a tow bar or a dolly for your toad, you should have virtually no weight on the rear at all as all the weight is carried by the front axle of the toad. And if you are towing a vehicle, you aren't going to have anything like the 8K that I pulled from ND to NC.
I hope that helps. If you have any questions, Post them here, or email me.
I have about 15k on my hitch towing a full size ford extra cab
bolted to the radius rods and a light attatchment to the rear bumper mount.
still no problems or visible stress.