How much rust is too much?
Looking at a bus, 2008 IC-CE. Here's a list of the rust that I have seen and its nature:
some minor surface rust on sheet metal near the rear wheels
some minor surface rust on the steps and driver's seat mount
battery tray has pitting, but still structurally sound
front spring and frame have some surface rust, but not the brush-off kind. it would require sandblasting or sanding prior to treatment
Underbelly paint is lifting on metal floor - fairly minor, sand blasting and painting will resolve that
Again - no structural, cancerous rust has been seen so far. Other buses on the lot were bad enough I didn't even go in them.
DT466 (220hp & 540ft.lbs)
Three inside heaters
The engine is in real good shape as is the transmission.
So... how much rust is too much?
and... what would you olde-timer-pros pay for something like this?