Question: Does the OBD II report the pressure in each of the air springs when that feature is ordered? If so, it should be able to calculate individual wheel loads. That is even more useful, because it would tell if you need to reposition the load to balance the truck front-to-back or side-to-side.
Their hitch calculation is based on the 10% number baked into the tag-along trailer industry. However, my research last year showed no scientific basis for it and it is not the rule in Europe. I imagine for most applications 5%-6% after adjustment of a weight distributing hitch should be about right (and not screw with payload limits), but nearly all trailers have the tongue length and wheel position to achieve 10% before WDH (I'm guessing that is about 8% after WDH adjustment).
The magnetic adjusting shocks would be a nice feature, especially in conjunction with the air springs.