Hi Beth and Doug,
These days it's not so much what we might like and/or prefer, but what can be towed without voiding the warranty. There are fewer models to choose from every year, so if you see one you like, be sure to check that specific vehicle manual to see what it says about towing. If all it talks about is using it for towing, as opposed to towing it, then the chances are good you can't tow it without the warranty problem should anything go wrong. If towable, there should be specific directions on how to do it, especially how to set the gear and key. Most of us prefer four-down towing instead of a tow dolly, so towing instructions are mandatory.
Both the Motorhome and the Family Motor Coaching magazines publish annual dinghy towing guides.
ArdraF