AlwaysDreaming,
I used to tow a Chevy Malibu on a MasterTow dolly with surge brakes. As you can see from my signature, I now tow a Ford Edge 4 down. The dolly worked OK and with the surge brakes was quite a bit cheaper than the 4 down tow bar and supplemental braking system. The dolly cost me about $1200 new and my Roadmaster setup with Brake Buddy cost me about $5000 installed. So why did I switch?
The dolly towed very well. I had no problems with stopping, even in a panic situation. I could hardly tell that the car was back there until it came to an uphill climb. Then the weight was noticed. The dolly becomes an issue when you are parked. You have to find some place to put it. In a long enough pull-through, you just leave it attached to your MH. On a short pull-through you have to unhitch it and push the tongue under the MH or pull the dolly around the side to leave it next to the MH. In a back-in site, you need to unhook the dolly and move it by hand to where ever you are storing it. At home, you have to have some place to store it until your next trip. All the moving around of the dolly becomes a pain. They are not light. I would guess 400 pounds. I never weighed the dolly without the car on it.
With the 4 down setup, I pull 2 pins, unhook the safety and breakaway cables and unplug the electrical cord. All that stuff stays attached to the MH. It folds up against the back of the MH and has a cover that goes over it all to make it look neat. Fast and easy and nothing to store. The Brake Buddy takes maybe 1 minute to install on the floor of the driver's side when leaving and maybe 30 seconds to unhook and put away when we arrive. Downside? $$$$$$$
We started with the dolly because we were not sure that we were going to tow a car on every trip. After a couple trips without the car, we decided that we will almost always take a car. Makes things so much easier. We take 10 - 15 trips each year (both retired) so managing the dolly got to be a real pain. After 2 1/2 years dealing with the dolly I switched to 4 down and could not be happier. If you are unsure, go on Craigslist and buy a used dolly with surge brakes. I sold mine for $750 so you can save some money that way. Try it for a while and see how you feel about it.
1999 Newmar MACA 3796 F53 6.8L
2016 Ford Edge Sport
Roadmaster Sterling A/T with Brake Buddy Select