Rent A Car
We travel without towing a vehicle. If we were long term motor homers maybe we would consider it.
In the meantime, I recommend Enterprise Rent a Car. Set up your RV for a brief stay, call (or previously arrange) Enterprise and they send someone to get you and take you to their location.
Rent the car, drive back to the RV and find the nearest mall or Whole Foods store.
One caveat: your RV park needs to be in range of the Enterprise office.
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