what you use is up to you. myself I would use 3/4 plywood laminated up against the floor from underneath with a brace across the floor joist. Of course that all depends on what type of floor bracing you have and the amount of room
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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