-Kevin wrote:
Flat bed height depends on the design but at a minimum you’re looking at about 4"-5". Most beds are over built by a huge margin but the general rule of thumb (for ¾ and 1 ton trucks) is C4x5.4 around the outside and for rails, C3x4.1 for cross-members (every 12”). Rails have 3" openings for the cross-members to be reassessed into them.
I have been doing a lot of research on this as next month I will start my build for the same purpose, more storage.
That actually sounds nearly as beefy as the 20 foot flatbed on my Isuzu NRR truck, and it was made to haul about 10,000 pounds.