[dkarb]

The engine is a Cummins V903.  The engine and the generator look, sound and run great.  My main problem is the rust damage.  I sent photos of the underside to the people at the Newell factory.  One of the Jims (Jim Gering) said it was the worst rust damage he’s ever seen and I think he’s been with Newell for a long time.   He seemed to think the rust was from being in a bad environment for a long time but I still suspect the wet bay.  The plywood under the holding tanks have a lot of rot.  The majority of the rust damage is under and around the wet bay.  Someone replaced some of the plumbing in the wet bay at some time.  I think there was a leak somewhere in the wet bay and the foam underneath held it to the frame and rusted away.  The only leak I found in the wet bay was at the flange where the toilet empties into the black tank and I fixed that.  I know from this forum that the holding tanks have a tendency to develop leaks but I can see no evidence of any other active leaks.  Maybe a combination of a bad environment and a wet bay leak?

Anyway, I included some photos (one showing some of the worst rust damage).  I appreciate any advice. 
To HoosierDaddy:  I grew up in Ft. Wayne.