My wife and I generally purchased new. However, with the way prices escalated just prior to the Great Recession (I think the DP I bought new in 2001 with an MSRP of $190K was something closer to $300K in 2008)and never seemed to go back down, when we started shopping for a DP in 2016 we went used. I shopped the U.S. via many websites. We ended up buying 1600 miles away, but the money saved was absolutely huge and worth the 3200 mile round trip. Most coaches we were interested in were using NADA pricing, but there were also a number of good coaches out there priced far more competitively to choose from and then negotiate even further. On this big of a purchase, shop the U.S. market.
For us, since a Winnebago Journey was one of our top choices, and what we ended up purchasing, we're inside 200 miles of Winnebago and HWH, and Freightliner/Cat/Allison is everywhere, so the major systems all had good service options within easy reach of us even though the coach purchase was far away.