I've never known that travel trailers have hiches on the back of them. If it's attatched to the sturdy "chasis" of the trailer it might be worth it.
I have 2 solid places to check out and ask. I'd contact a company that manufactures the ramp thing that the motorcycle attatches to. Of course preferably a company that you can see yourself buying one from anyways and email them a message as well as a picture of your setup.
I'd also check out (if you got one near you) auto shop. I'm pretty sure they wouldn't mind taking 10 minutes away from there work to give some advice, and I believe most mechanics know about welding and stuff.
But from my opinion, if the travel trailer has a hookup in the rear that's connected to the "I-Beams" that make up what I call the trailers "chasis" then maybe it will be solid. If it's connected to the bumper then that all depends on your bumper situation and I don't know. But also if you have a local welder/fabricator and some $ I'm sure you could get yourself situated real good. And hopefully you have an adjustable ball on your towing vehicle to get balance on your trailer
Myself, I fit my motorcycle diagonally in my F-150 short bed just fine