I have a similar setup towing a 2019 Ford Fusion Energi with a Ford E450 Class C motorhome. I am amazed that you need a 10" drop hitch. The rear of your motorhome must sit rather high. My Roadmaster tow bar goes directly into the hitch receiver on the rear of my motorhome and the tow bar is within 2" of being perfectly level. Bottom line - - I have experienced none of the issues that you seem to be dealing with and I've towed my Fusion Energi over 12,000 miles with this setup. Sorry to not be of more help.