The 19' Scamp is a 5th wheel I'd seen previously, although never on a RL (G1 or G2). The 2200-2800 lbs listed is dry weight; the Scamp people say loaded somewhere in the 3500 lb range, with a pin/tongue weight of 400-500 lbs. Those are easily within the capacity of a RL and still leave a bit of margin for gear or passengers in the truck.And I'm not sure one of these wouldn't work? 2200-2800 lbs.
Deluxe but Lite 19' Fifth Wheel RV Travel Trailers - Scamp Trailers