Maybe you can pick up cargo along your route...

Even moving rv's ( travel trailers and fifth wheels ) requires commercial insurance as you are doing it for gain. That adds in all the same things as if you were hauling goods in a box trailer or flatbed trailer. On top of it, you must have a CDL. And all appropriate endorsements. Then add in that you have to stop at all weigh stations and have to keep a log and it can be a real pain. As I said, best left to the pros.