When I removed the engine from my MH, I first pulled the intake and exhaust manifolds, then I pulled the heads off leaving just the short block with the oil pan. Then I rented an engine hoist that broke down into pieces. Laid some plywood on the interior floor an reassembled the hoist inside the coach. Pulled the block and rolled it back by the side entry door and set it down. Disassembled the hoist and reassembled outside the entry door. Reached the hoist in thru the door, picked up the block and rolled it outside.
Really not that hard. If you have enough room at the doghouse opening and at the entry door you may not even have to pull the heads. My 460 engine was just too wide otherwise.
Mind you I had the advantage of a big slide out which gave me lots of floor space. You may have to pull furniture to make this plan work. Get your tape measure out to double check everything.
Best of luck with your swap.
1995 Coachmen Santara 360MB 36' w/slide.
Ford F53/460 chassis, 2020 Chev Equinox "toad"