I posted some pictures in my gallery of the driver's side bottom of my cab and rocker panels - hope I can put in a link to it. This is the worst side - the passenger's side has rust but isn't as bad. The worst of it appears to be a hole in the cab that is open into the area where the ebrake is located. The rockers have apparently been worked on previously with some kind of thin sheet - not a great job. I can see my way to doing some work on the rocker panels, maybe even some welding, but I'm trying to figure out whether there is some halfway decent fix I can do for the holes in the cab body. I bought some POR15 a while ago just for general rust, but I don't see a way to use it very effectively here. I probably will put some kind of temporary plug in the large hole near where the ebrake cable goes thru the floor; thinking of using expandable insulation foam or something along those lines. Any ideas on either a temporary or (better) a permanent fix? Thanks.

https://www.f150online.com/forums/me...+problems.html

 

that looks like my old truck. 2000 f150. rust and rot allover bottom. especially support beams for back of cab. Ended up trading in last year, 94,000 mi. I went to dealer for advice, he said trade it in. overall truck looked almost new, just don't look underneath.