Welcome to the forum.
The best info is in the owners manual of the vehicle. It will tell you if it can be dinghy towed and also give any restrictions for speed or distance.
If you are looking at possible toads, check
Remco Industries Towing. Just fill in the information for the car that interests you.
There is also a
Dinghy Towing Guide. I believe it's updated every year.
Check the towing capacity of your RV and make sure the toad is not too heavy.
Enjoy your travels.