The Peak chassis has the same GVWR and GCWR whether you have a 34' or 40' coach. So the Cargo Carrying Capacity of the 34' is actually the highest at about 5,700 lbs. The rear axle is rated at 19,000 lbs. for all of the models in 2003, and the front is rated at 12,000 lbs. My 34' is heavy in the rear, and the Hydralift will reduce the weight in the front and definitely add 1,000 plus lbs to the rear axel, taking into account the fulcrum effect.
Maybe a trip to a weight station and see how much the coach is loaded would be a good place to start.