What kind of Class C is it?
A Class C built on a Ford chassis with the V10 engine is of no concern with respect to that (low) mileage. V10 powered Ford commercial vehicles often remain reliable into the hundreds of thousands of miles.
Much more important is the workability of the appliances and has it's roof or windows or vents or roof antennas caused leaking into the interior of the walls. If the appliances work and there's no evidence of leaks and it's on a Ford V10 chassis - and if you can find a way to come up with the money - I'd say "go for it".
P.S. We have around 49,000 miles on our 2005 Class C and it better-have/has years of life left in it. We still consider it as "our new motorhome". But it does take maintenance to keep a Class C going down through the years. A motorhome is not like a family vehicle to keep in pristine shape - it takes a lot more time and money with the motorhome, due almost entirely to the "home" part of it - not the "chassis" part of it.