I have had the Ford F53 chassis with the V10 for 12 years. The first was a 2003 which I had for 10 years 35ft long. It was a 2valve (20 total valves). Never had a problem with the tranny or engine. Averaged 7-8 MPG towing an escape hybrid (after break-in, around 7k miles). Decided I wanted a different MH to go into retirement. So we let the floor plan we liked, generate the engine/tranny. Gasser or diesel did not matter as the floor plan was the decider, after all if you are unhappy with the floor plan, you won't like the coach no matter what engine. Floor plan we loved turned out to be a gasser, 3Valve (total 30), V10. MH is 37ft long. Only have 3.5K miles on it so it is not broken-in yet but have averaged 6.4 to 7.2 MPG towing the Escape hybrid. This tranny is a 5 speed and has Tow-Haul mode (my first was 4 speed and no tow-haul mode). I need more time and some very long trips to do a good evaluation, but so far so good. Handling was very good, but added a Blue Ox TruCenter to the front and a TigerTrak bar to the rear. Now it handles like a dream. Just my thoughts, I am sure some will agree with my choices, some will not...they are my choices, yours may be different...but they will be yours to make. Have fun, camp often.