Let me offer some thoughts about moving from a nice Class A diesel motorhome to a trawler.
I would guess that a 34-36' trawler has about as much living area as a 40' motor home because the beam (width) is much more in a trawler- 13-14' vs 8' for the motorhome, although the motorhome carries its width all of the way forward unlike a boat.
Motorhomes like yours are currently listed in the $200-300K range. For similar price listings for 34-36' trawlers you have to look at one several years older, maybe a 2010 would work. Some that would fit are the Beneteau 34 and the Nordic Tug 34. Both are nicely done mid range trawlers.
But unlike a motorhome, where everyone starts out knowing how to drive, understands the traffic rules and with a little practice can operate a motorhome, a boat is a different beast. In the abstract, operating a boat should be as easy or maybe easier than a boat. But unlike a motorhome where if something goes bad- weather, mechanical systems, etc you can just pull over to the side of the road, call Good Sams and find a motel, boats don't work that way. They can kill you.
So, if you are really keen on switching to a trawler from a motorhome (and almost all go the other way) then charter one with a captain, take some seamanship courses, charter one on your own.
If you still like it after all of that, sell your motorhome and then look for a trawler. Finding someone to swap with you will be tough.
David