There are several so called wholesale RV dealers than do more customer order or sold order sales than order for lots and wait for a buyer. These dealers are also the ones that offer nearly the best pricing. So there is no reason to pay more for something that is sitting on a dealer lot already.
I personally would not pay more than 70% of MSRP for any RV. 30-40% off MSRP is the good range, assuming there are no trades to play numbers games. For Jayco, I highly recommend getting a quote from
RV Direct. Whiel you may not be willing to purchase out of state or deliver from RV Direct, at least you will know what nearly the lowest price someone in the country is paying. You will have to formulate your own threshold for transportation/local convenience costs.