I recently took a trip hauling a trailer with ~14klbs load. I asked Waze to take me "Home". It took a strange route up and down a large 9% grade mountain that was not needed and was not all that fun with the truck/trailer.
Anywho...was wondering if you could add a Truck/Camper/RV mode that kept you on major highways and avoided low overheads and weight restricted bridges etc.
With the data you curently have, it should be pretty easy. You might pick up a few more truckers hauling freight.