Here are some pictures of the problem area - the depression shows up good in this light. I can push that area in easily - it seems to be due to where they punched the gas filler door. The driver side feels solid in that area and doesn't push in like this side does. Another thought I had was to bolt a brace to the area where the door goes to hold it solid, and bolt the other side of a brace to the inside panel or floor.
Hoping this works- this is through photobucket.
Also another view:
And a picture of the tail light gap - I'd like to fix this but do not know how.