Tonneau + T-slot tracks + Racks combo ?

Extendable Adjustable Height Truck Bed Cargo Rack Truck Ladder t slot racks The cross bar length of the product can be adjusted to 71 inches thai slot png Building it like that, without all those fancy 90° brackets and side plates, you'd be able to stand on it With 90° brackets and side plates,

t slot milling cutter diagram Designed to be compatible with T-slot rails allowing you to bolt directly on your cover Covers with T-slot rails compatible with TUWA Pro T-slot bases: