We have experienced sleeping in our 29 MV ten nights and have come to the conclusion over the mattress supplied with the Jayco Greyhawk 29MV ....... "IT SUCKS" ....Plain and simple.
The short queen is just "too soft" to generate a good night's sleep for us.
The wife and I spent the afternoon RV Mattress hunting. Every stop was the same. "SORRY, we don't have RV mattress's, your best bet is Irwin's Mattress Mart".
Fortunately, we have Irwin's Mattress Mart here in Cajun Country. In business since 1958, they can create a great mattress (spring, foam, or both) to fit your needs, specs, and price range.
SO .... It's just a matter of time before we have our great mattress.