We just picked up a new 2015 Grand Design 328M today. I was on the fence on buying a toy hauler with the weight but it seemed to pull the same as our Montana 33'. I only pulled it back from the dealer (approx. 20 mi) though. The truck didn't squat anymore than the previous 5th wheel. I like the 6 point leveling system.
2007 Dodge Ram 3500 Cummins SRW, Airlift airbags, Bilstein shocks, Smarty Jr., stainless turbo back exhaust, B&W Patriot 18K
2015 Grand Design Momentum 328M, disc brakes, Progressive Industries 50 amp EMS