I had good luck leaving the top on,removing the front clip and doors....then had four "come-alongs" attached to the rafters in the shop,one on each corner-then slowly ratcheting each corner up. Raised it just enough to roll the frame out from under. If you don't have access to a shop-a guy might try using a jack and blocks to lift the body enough to roll the frame out-but be sure the blocks/stand will not tip or slip on you!
Have'nt got to floor rust repair yet,but agree....keeping the body on the frame for repairs sounds like the way to go!
