I can't tell you how to improve this design. I've looked at many of the 3500 based RVs and came to the conclusion that they did not have enough capacity for what was built on them. Seems like if you carry 2 cans of soup, you are likely overweight. I've installed air suspension in the back in my super-C, and that helped the ride, but i don't think it's an option for you.
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