You make an excellent point about a dolly. I researched dolly's and small trailers. I keep all our toys on our property which is relatively large for Southern California but painfully small compared to the rest of the country. Adding a dolly or trailer seemed to be one more thing to have to find space to store. You can back up a trailer but not a dolly or a four wheel down Toad so no dolly advantage there. Depending on the vehicle being used with a dolly, there are still procedures that need to be done to the vehicle, especially if the vehicle is rear wheel drive or an automatic. some vehicle owner manuals say four wheel down towing is OK but not two wheel down. Some of the places we stay lave strict limits on motorhome length and do not allow trailers or dolly's on camping spots. After some practice I fell I can hook up our Toad and be ready to go, in the same or less time than it takes to hook up a dolly, drive the vehicle onto the dolly, secure the wheels, etc. As to cost, yes the dolly would be cheaper.
Following is a picture of the front of our Smart car Toad. The tow bar hookup does not use a cross brace on the tow vehicle which I like. The connection points for the tow bar go into receivers behind the front grill and turn to latch and lock. Less than thirty seconds to take both of them off or put on.
John & Gloria Hunsaker FROG Member CA-0030-988
2014 Georgetown XL 334QS (class A with 4 slides)
2013 Smart Car TOAD
Blue Ox Aventa LX tow bar, base plates, diode kit
SMI Stay-IN-Play Duo auxiliary braking system
25' Off shore blue water fishing boat