Most likely you are overweight in the rear end. Visit the CAT Scales and find out. When I bought my last class C, it was right on GAWR, but 900# over on GAWR rear, and 1400# under GAWR front. It took some serious rearaingement of stuff to get it right. Afterwards, I was amaised at how much better it drove.
TeamFoxy ~ Traveling North America
2016 Newmar Canyon Star 3710
2017 Chevy Equinox in tow.