That’s something i often wonder–how do they manage to load stuff in/out? I’ll always remember a woodshop class i took and someone asked me to help lift a chicken coop they built into their truck. It was heavy af to begin with but the extra height to put it into his big/tall truck made it a much more difficult task. It’s just stupid, really–no benefit i can see and further drawbacks seem inevitable ¯\_(ツ)_/¯