If your trailer is less than 2 years old don't mount it on the frame our you will loose your frame warranty. I was told by Lippert if I drilled 4 holes in our frame to mount a reciever hitch for a bike rack and two bikes I would void our warranty. If it is older than 2 years than you might be fine with it. I know I personally would not put that much weight back there but there are many people doing it, some even more weight than that. Is the bike and carrier 180 lbs or just the bike?
17 Chevy 3500 DRW 4X4
16 Mobile Suites 36RSSB4
2 Mini Dachshunds
i also made a front hitch dirt bike carrier. mine fits two. i made mine w/ steel so it is heavy. there are plenty of aluminum racks for sale on line. just google motorcycle carrier. i never figured out how to post pictures but if you want i'll e-mail them to you. i carry my suzuki dr 350 and my sons honda xr 70 or his suzuki jr 50. works great. also the receiver on the fords front hitch sits a little high, so i also made a drop receiver so the bike does'nt block my view.