I did not have a vehicle I could flat tow so I invested in a Demco KarKaddy SS and it is great. My GreyHawk 31KS tows it very well and I have not had any problems.
-I agree there is about 15 min hookup time needed, but I carry a 4’x5’ blue tarp and 18”x36” pad to lay on to stay out of the dirt or wet grass and it is fine. The wife drives it on and I hook it up. I use a box in the toad to store gloves, lights, tarp etc.
-I agree the steering on a dolly is needed for it to track the RV correctly
-I would add you can only back up in a straight line for a short distance (5’-10’) before the car goes one direction and the dolly another, so you have
to plan on that as you navigate fuel and coffee stops
-Dropping the car before backing into a camp spot is never a problem, but a pull through is easier. You cannot see the unloaded dolly behind the RV as it is not wide enough. If you backup slowly and watch for the dolly in a mirror you can back it into a spot on the first try. Practice before you have an audience.
-I added rear lights as some states require them and they make sense. A simple splitter off the RV plug connects the Dolly and toad trunk lights so they all work and connect quickly.
-Get the spare tire and be sure your jack and lug wrenches will work if you have a flat
-I have Truck Systems Technologies TPMS sensors on the dolly and toad along with the RV and they have saved me from problems several times so I believe they are worth it