In Colombia people for years removed the factory beds from small pickups and installed wooden stake beds the idea being they hold more. In recent years some of the companies started selling "cab & chassis" versions which you would take to one of the many shops that fabricate and install stake beds. Choice of steel or wood floor depending on your needs. Here is a model 2006 Mazda 4x4 that I bought new as a cab & chassis.
Sony a6000 w/24mm 1.8, Canon 7D ll w/400mm 5.6, Canon 7D w/100mm macro, Canon 580 EX ll and 600-Rt Flash, Panasonic Lumix LF1