I would recommend separating the tow vehicle from your 5er. Level the RV using front jacks. Also if not in use and cold temps are expected, don't forget to winterize it(them).
Best of luck.
Ford RV V10 5 star Tow tune
Front/Read Roadmaster 1 3/4" anti-sway bars. Roadmaster steering stabilizer
2009 Acme Tow dolly w/ 2014 Avalon Hybrid Limited