I've got a 2015 Grand Design 27RL. Advertised as half-ton towable. Brochure listed spec's are Unloaded Vehicle Weight of 8013 lbs. Hitch Weight of 1516 lbs. Had my truck and trailer weighed at CAT scale both hooked up and truck by itself. Real world weight with two people in truck (2004 Silverado 2500HD crew cab) and the normal amount of clothes and camping stuff for 2 people:
Steer Axle, trailer attached: 4140 lbs
Steer Axle, truck solo: 4140 lbs
Drive Axle, trailer attached: 5120 lbs
Drive Axle, truck solo: 3220 lbs
Pin Weight: 1900 lbs or 384 lbs over advertised dry pin
Trailer Axle: 7100 lbs
GCWR: 16360
Truck weight Hitched: 9260
Truck solo: 7360
I'm not convinced that this is a 1/2 ton truck fifth wheel.
On edit, I looked again at the brochure and I didn't see anything that said the 27RL was half-ton towable, only that it is a "super-lite fifth wheel"