We started our RV'ing life style in 2011 towing a PT Cruiser on a car tow dolly before getting tired of messing with getting the vehicle on/off the dolly and storing it when we reached our destinations.
In 2012, we adapted the car to flat tow then traded the PT Cruiser this year for a Jeep Wrangler to simplify our vehicle towing experience even more. We had a Master Tow 80HD as mentioned above equipped with the surge brake option. The dolly seemed to be well made, towed well, and we were able to purchase it locally (Indy area) for less than $1,500.
I did notice a couple of times that the surge brake would activate when we hit a hard bump in the road which was a bit unnerving. Other that, the surge brake seemed to work OK.