For comparison, is the OP's question -> FRED vs. Gasser, or FRED vs. DP?
If it is the first, then I can report that the '08-'09 Outlaw's came in Ford F53, Workhorse W24, or Freightliner FRED. So, for an apples to apples check, these RV's were identical above the chassis, but the FRED had the best power(similar HP, but 1/3 better torque), best MPG (unless the owner has a heavy right foot because they don't like being hot-rodded), highest GVWR, and highest resale value.
If you like the floorplan, a FRED is a good, proven platform that should run a very long time.
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV