a "turntable" style dolly (Mastertow, American Car Dolly, etc.) is, in my opinion, an adequate choice.
A dolly with king-pin steering is a better choice, although more expensive (DEMCO Kar Kaddy is, IMO, the best).
I have seen good used KK dollys, with surge brakes, for sale for anywhere from $750 to $2500. A new one, however, is a budget buster.
The American dolly is about $1500 (I haven't checked the price recently), delivered to your door, set up and ready to go.
The Acme dolly is a fixed platform unit. The cost is comparable to the American, but you have to pay shipping and assemble it. Personally, I would never buy any fixed platform dolly. That is, of course, just my opinion. There are those who swear by them.
Good luck in your hunting.
By the way, I towed a 2006 PT Cruiser convertible on an older Demco Kar Kaddy from Montana to Georgia and back, with no problems. The fenders did not hit the car at any time, nor did the ramps contact the rocker panels. BUT, the dolly did not have brakes, so I sold it. Now I realize that selling it was an incredibly stupid thing to do! In the year that dolly was built (late '80s or early '90s), there were two versions, a wide one and a narrower one. Mine was the narrow version.
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