I realize this is entirely too serious a response to such a humerous picture, but IMHO, I think it's not overloaded (at least by weight) - those camper shells aren't that heavy, even with stuff (junk?) inside. OTOH, it truly appears the truck was hit - HARD - in the rear, causing the middle of the bed frame to buckle upward; I'm guessing that happened even before the camper shell was so expertly (Ha! LOL!) semi-installed on the truck bed. I notice the two wheel openings are about the same, indicating the truck is generally operating at a level ride height, thus my thoughts.
Wonder what Scott from YouTube channel "vehcor" would think (other than dying laughing....!)??