[Grumpy old man]

Looks like someone's attempt to raise the bed floor failed , When they cut the wheel well openings on the inside of the bed to raise the inner wide wheel tubs they removed a lot of structure that needs to be replaced , By removing the structure from the inside of the bedside to make room for the tires to tuck without being reinforced again the bedside will flare out and the the ends of the bedsides will drop , Use your long straight edge down the outside of the bed and see how much the top of the wheel well has bowed out . . The bed is sitting way to close to the cab and whoever started the bed modifications most likely didn't own a square , time to see if the cab is actually sitting square with the frame and reassess the problems with the bed , it's all fixable with a good body man with a cut off wheel and a welder .

Post more pictures of the inner bed and down the sides of the bed also from the back to show how the tailgate is sitting .


https://www.youtube.com/watch?v=LKlYLf2oA8I