Looking at a 5th wheel 2015 Grand Design Reflection 337RLS (2090lbs pin weight). Will my 2018 4x4 crew cab chevy diesel pull this RV? Trucks says max 5th wheel is 13,500. I'm just getting into the RV scene and like most people find out the RV dealers don't know and the vehicle dealers don't know either. Truck says my combined weight of occupants and cargo should not exceed 2373lbs, truck has 245 tires. My calculation say get a smaller 5th wheel maybe a 303RLS (1660lbs pin weight). Am I on the right track? air bags?