Rental car, mass transit.
We tow a small Honda with our current MH. However to answer your question;
With our ole Toyota, we would rent a car at our destination. The Toyota could barely tow itself, let alone a TOAD.
As Bruce mentioned, some rental places will pick you up. Another option, simply stop by the rental place on the way to the camp ground and pick up the car, then drop it off on the way out. Avoid pickups at airports, there is normally a big surcharge tax for airport pickups.
If you know your going to be renting, I recommend making a reservation. Check pickup points as prices can vary significantly for the same car at pickup points just a few miles apart.
ALSO - Some places, having a car is a liability, i.e. Washington DC. Check with the RV park, they may have a bus stop that is convenient to what you want to see. Example: We stay at Cherry Hill Park when I have business in DC, I then take the Bus/Train into DC. We stay at Holiday in VA Beach, The bus takes you right to the beach, AND, you don't have to screw around finding, AND PAYING, to park your car.