This one might be a little stronger than you need. But it will mount to the front of the trailer, and sit above the propane tanks.
![](http://www.etrailer.com/Merchant2/graphics/00000001/pics/C/C/CC-275_23_50.jpg)
http://www.etrailer.com/RV-and-Motorhome-Bike-Racks/Stromberg-Carlson/CC-275.html$200 it is kinda expensive, but probably a lot of steel, so worth the money that they put into making them.
As for my thought, that is a lot of weight swinging way up in the air, and I probably would not order one. I just put my bike into the camper when I had a camper, but now have a bike rack that goes into the 2" receiver on the back of my motorhome. I welded two extra 2" receiver to the hitch, one next to the drives side frame mount, one next to the passenger side frame mount. So I have 3 each 2" receivers on my motorhome hitch.
I use one of the receiver for my Sacco dog cart, one for the bikes, one for the car in the middle.
Fred.