Even though there is a half inch bolt with 3 inch washers, top and bottom in all four corners, going through the camper floor and through a reinforced part of the aluminum truck bed. I decided because it’s only foam and fiberglass to add a turnbuckle to each corner. This gives me a bit of peace of mind, especially riding on rough roads. I used 8” eye bolts and they’re mounted into the 2x4 aluminum bed frame rail for structural support ..The gnome gnose….