Hi, I removed my truck bed from my 1990 F-150 searching for an obnoxious squeak. I think I’ve found where it’s coming from. My question is, does anyone have any suggestion on what type of maintenance, preventative maintenance, inspections, etc. to look for while I have the bed off and total access to the rear half of the entire chassis?? I don’t plan on taking the bed of ever again so I figured I should take advantage and knock out anything that might be a lot easier while I have the access. I’ve noticed that my fuel filler neck hoses are pretty old and dry rotted so I’ll replace those. Anything else I should check for or inspect while I have the chance? Thanks!!