[sevt_chevelle]

Hmm

Are you gonna gain back the money you put in that truck? I can tell you the inner wheel lip is also rusted, they rust from the inside out. Also willing to guess that the rockers are toast as well.

I have welded on countless parts in a collision setting, and never worried about the gas tank. Wrap the filler opening several times with masking tape and be done with it.

If you remove the box I would do yourself a favor and remove the rear bumper.