Hi,
I did the Banks system at the factory when my RV was about a year old. 97 Bounder. I don't know if the mileage changed much, but was towing a Manx dune buggy and went to a heavier Honda CRV, so mileage should have gone down, but did not.
The Trans Command was really worth it. The shifting was terrible before, and would downshift at the smallest hill or change in throttle position. Now it is much better, and many times I would lock out overdrive as I got close to a mountain so that I would not shift under mostly full throttle.
The E4OD transmission was great in trucks, but I don't know how well they would last in a motorhome for 90,000+ miles. I only have about 45,000 miles on mine.
Fred.
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