It seems my '98 Ranger pickup bed sits crooked, or uneven when viewed from the behind. I took a picture of it parked on an absolutely level lot. It seems it's just the very back tailgate part that is unlevel, as up in front of the bed it is even and level with the botom of he back window. Not sure how well it's apparent from my picture, but there's a definite slanting down to the left (when viewed from behind) of the back of the bed. I've noticed it that way parked in my driveway and other places too, that slanting of the back of the bed when viewed from behind. The leaf springs look fine on both sides and the distance from the ground to the bottom of the axle is even on both sides. So does this indicate a badly worn shock absorber maybe on that side, or if not necessarily what else might be causing this?

Can't find replacement chrome bumper. Can I just hammer out the dents, use body filler, and paint over it?