Today we did a bit of shopping in preparation for the chassis/new floor work. Went to Tractor Supply and purchased some sand to sandblast the chassis with. After this is done, we will purchase 2 1/2" 4'x8' sheets of plywood for the floor. I'm planning on coating both the chassis and the bottom of the floor (facing road) with a product I found mentioned on the Teardrop forum, Black Asphalt Fence Paint:
After the bottom side of the floor and chassis have been painted with this sealer, we will then staple a sheet of roofing paper to the plywood over the sealer. Then the floor will be ready to be attached to the chassis.