What year model is your 6400? I have an '09 model and have not had any of the bounce problems that you have mentioned. I wonder if they have done something different on the suspension for the '09 models.
I have traveled with the tanks about 2/3 full (which means more weight on the back, and still no bouncing issues.
As T.C. mentions, the ride in the coach is a little bumpier than up front, but it's 100% better than the Kodiak chassis I had before.
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