My comment here is likely a mute point right now, but I'd like to share this.....
Back in 2006/2007 when on the search for a replacement motor home, the E350/E450 based, scaled-down B+ Isata Sport was on our short list. From what I could tell on-line, they were well made of which their exceptionally high price back then reflected it. The cost for a new Isata Sport was out of reach for us and a 5 to 7 year old cost nearly the same as a new made-for-us Phoenix Cruiser 2350, so we went with the P.C. To this day I have never seen in person, a 1999-2007 Isata Sport E-Series in person. It's too bad they discontinued the reduced size scaled-down E350/E450 B+ platform. Today the E-Series Isata-4 is your typical class-C beast, designed over-loaded. If considering that one, I'd surely step it up to the Isata-5 or more capable DX, DQ, or Force chassis.
Dynamax had been independently owned until the 2008/2009 recession, picked up by Forest River. I heard F.R. made a few changes for the worse, but nothing serious from what I gather. Dynamax is still noted for being a high-end quality unit.
The load capability of the Dynamax Rev is concerning as is every class B+/C built on the Dodge Promaster. If you can work with it's limitations, then no worries. Our old Phoenix Cruiser 2350 with a 11,500 pound E350 chassis is smaller than the Rev, carries 2200 pounds more than the Promaster and we use all of it. I can't imagine where I could drop 2200 pounds and still make vacationing work right for us.