I removed the upper bunk in my Wolf Pup BHS16. It was a PITA getting the screws out. Had to remove the luan top to access them and remove and reroute the wires to my thermostat. It was just a 2x2 frame with several cross braces. You’d have to rebuild that frame to make it a shelf. I installed a wood clothes rod up near the ceiling from the back wall to the cabinet above my dinette.
2019 Wolf Pup 16 BHS Limited, axle flipped
2019 F150 4x4 SCrew SB STX 5.0 3.55 factory tow package, 7000#GVWR, 1990 CC Tow mirrors, ITBC, SumoSprings,