Depending on how much needs covering I would keep an eye out for any extra linoleum flooring....
But in the meantime paint and seal the floor w/ kilz and caulking, then find a large enough piece of linoleum to work, glue it in and seal that baby!
I just picked up an 85' 4runner that im currently rebuilding to go snow wheel'n and ski'n this season. She's a lil banged up but i'll prob be in lots within reach of butte, MT.