Check this TDS link - https://www.slingshotforums.co…ental.160881/#post-800361. There's a pic of a U-Haul trailer with a wooden platform on the back to support the rear wheel. A couple years ago, I saw a Penske rental vehicle trailer at my local Home, Depot that looked to be the same model as the U-Haul trailer in that link.
That's not a bad idea and could easily be towed behind an RV... 🤔