Yes these are technically Class C units or Super C units. In reality they are TC's (Truck Conversions) which have a lot more in common with Class A DP's or FRED's than most units discussed on the Class C forums.
Our Dynaquest 36 XL has excellent ride and handling especially after changing out the OEM front shocks for Koni's. DW plans on sharing the driving duties on future trips. Our rig is built on the heavy M2 chassis (22.5's) with Cummins ISC 8.3. We have the 20K hitch and have hauled a car hauler with truck, bikes and kayaks loaded without noticing a significant drop in performance or economy. Can't really tell you how the ride is in back since we both ride in the air ride seats in the cab when traveling. No comparision to our Intl 4700 MDT.
Saw a DQ380XL at the Daytona rally that I liked because of the increased headroom (addl 6 inches IIRC) and I think it also had a heavier hitch option.