We have an '04 Tahoe 4x4 with the 5.3 and 80k on it. Bought 4.5 yrs ago with 35k on it then. Thought we would keep forever. It is super nice. Rocker panels have some rust and the frame has rusted out from under us. She loves it but is afraid of it. Have a guy that will put a new (old) frame under it. My muffler guy says forget it I should see what the salt trucks look like. Maybe weld in some angle iron and forget it.... Is it worth fixing or just trade it off? Patch it or frame replacement???