More helpful advice. Thanks guys!
I believe I will pull off the cab this weekend and see if it changes the level of the rails. I figure I have to get under there eventaully to clean it up and paint. Might as well do it now!
I will get back to you guys and let you know the results. I have examined that frame over several times now and I do not see any signs of damage or frame bending from an accident. I am keeping my fingers crossed that removing the cab will level it off.
Ross