I really can't see a body swap happening
Because with a class C RV, they don't build a body and drop it on the truck chassis, not the same thing as box trucks etc..
They start with the floor, then add the plumbing, then add the walls, roof then interior
It's built from the inside out
With things that come thru the floor and around the frame
This whole titling discussion is practically a moot point
The op could rip his RV to the frame and drop a trailer on there
But he is not going to be able to economically lift another mh house OFF it's chassis and transfer to his chassis