I would think there's a market for both.......just do look at all the RV's for sale online and on the lots. I've sold 3 motor homes myself.........1 gas, 2 diesels.
Gas I sold in a couple of weeks
1 Diesel I sold in a couple of days
Other diesel I sold in about a month
All boils down to being priced fair........and someone out there wanting you coach.
If you're over priced, you won't sell either a Gas or Diesel rig.
Brian