The one thing none of these companies discuss is how the 1000# or so of extra weight is going to effect the handling of the coach. A large diesel pusher will probably not be effected, but a gasser with such a large rear over hange will be effected. One thing is the aditional load placed on the rear axle and the other is how much it will unload or lighten the front axle.
Best to do some homework on the weights and see where you stand.
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