Originally Posted by TheDubs
Our manual says our entire rig shouldn't weigh more than 12,300 lbs when fully loaded but doesnt give us the weight empty.
12,300 is that GVWR or GCWR???
Highly likely you'll be overloaded GCWR wise. You are probably already at or above the GVWR with the Brave, fuel, and passengers alone. That's the nature of the RV beast, right up to the limits out of the factory gate.
Turbos and gears and air helper bags won't change weight rating. Weight ratings are based on suspension, braking, chassis components, and other factors. Your main concern (and everyone driving around you) is stopping that load. Sure, it'll pull it. But, you won't stop it very well - especially compounded if you fail to use a supplemental braking system in that truck.