Great ideas and comments so far. #1 being having a unit inspected before you purchase, also IF you decide to purchase some sort of warranty be very aware of the
restrictions and limitations. In my opinion warranties are a waste of money. Take the money a warranty would cost and put it into it's own account and almost guarantee
you will be ahead in the long run. (my opinion, I get piece of mind from other things).( also based on my experience logging repairs, flat tires etc.)
I have been a mechanic for a lifetime, I know that the diesel Mercedes is a excellent engine however getting it serviced. MB dealers do not service these coaches. IF
fuel economy is the reason, the cost of servicing the coach will eat up those savings.Do some research on shops in your area would service it.....not many if any....
Now,the Ford v-10 is a fuel hog. My class C averaged 8.5 MPG over a 40K mile period. I towed my Jeep, I drove in the mountains I drove flat lands. BUT, that engine is
reliable, easy and cost effective to maintain AND most anyone who calls himself a mechanic can repair/service it.
Appliance in RV's are mostly the same ,I have been around 40K dollar RV"S and 500K$ RV's and they all experience the same issues from time to time.
The Ford V-10, carry some spare ignition coils and keep the oil clean and expect many many miles of carefree driving. Sure, everything fails from time to time however
once you are out in some quaint little town and it won't start , well it may be a long tow trip........