I don't to minimize all the work we had to do to the motorhome. It had sat for a long time, we think about 5 years and was not used far as we can tell. We are going from safety inspection sticker and things like that. That can do more harm then anything in our opinion. We replaced most of the hoses and things like that. Had to lubricate the heck out of the bays and replace a lot of gas shocks, they had not been opened and shut and we are still getting them limbered up. As has been stated many times these machines need used.
We were really concerned when we bought it as it had no maintenance records and it had leaked. The skylights were all bad, just old, when I pushed on them they easily broke. We put on Liquid Roof, I ordered all new skylights from Fleetwood, the big middle one they had to have made. We put on all new Maxx Air covers and I got a switch from Fantastic Fan and there were some cracks on their covers and they sent me all that free, isn't that something.
We also took out our 13k AC's they did work and put in new 15k units. We had everything serviced, and a shaft in the genny broke on the waterpump so had to replace it and rebuilt the alternator and replaced belts all over the place. But I would say 90% of ours was maintenance.
But we have had her out about 2300 miles and used no oil in the genny or engine. My husband was really concerned but it only had 120k miles. The odometer quit working and I bought a new one from Fleetwood but it is only accumulating about a 1/3 of the miles so we are putting on a hubometer to keep track for mileage and oil changes. He is also going to put an hour meter on the generator as that guage does not work. So its not perfect but we can live with the minor stuff long as she runs good.
I'm sure the new ones are faster. She starts out slower then others I'm sure from stoplights but once she gets up to the 30's and the turbo charger takes off.