Our custom true flatbed truck camper build thread

I am nearing the point of being finished with welding, but I still need to weld on some mounts for the tiedowns.

What do typical 4000lb truck campers use in terms of tiedown beefiness? I was thinking of just welding some 1/4" steel plate with a hole in it to the underside of the outer frame 2x1 beams (those are 1/8" wall thickness) near the corners. Should I go crazy with reinforcement here, or possibly that would be enough?