We flat tow a Chevy Equinox behind our Class C. I did a ton of research prior to making a decision on which way to go...flat tow, dolly or trailer. I think your decision hinges on how you are going to spend your time on the road. As an example, we drive to a campground, unhook the Equinox, and use it for our daily transportation. Then when we're ready to depart, we connect the umbilical, the arms, and the brake in the car, and off we go.
Except for the time going from Point A to Point B, we normally spend less than a week at a CG, so if you dolly or trailer your car, what do you do with that extra equipment while at the CG? If your site is on the smaller size, does the CG have room to store the dolly or trailer for you? Do they charge for that service?
One post I read on this site several weeks ago about the same issue mentioned that when putting your toad back on the dolly, that you must lie on the ground to strap the wheels to the dolly. What if it was raining and the ground is wet and muddy? I have never used a dolly, so I can't verify the process used to secure a car to a dolly, so that's something you'll need to figure out.
I have a car trailer that I use to haul an antique vehicle to car shows. I know the process necessary to get the car into the trailer and strap it down, but again, what do you do with the trailer at a CG? If you are staying for a long period of time it may be different, but for short-term stays you have an additional piece of equipment to deal with.
Again, I may be a little biased toward the flat towing, but I'm sure those who use dollies and trailers can chime in and tout all the reasons for going their way. We had two cars when we bought our Class C, neither of which could be flat towed, so we ended up selling one and purchasing the Equinox specifically for flat towing. An extra cost...yes, but we're happy with the decision we made.
Susan, Ed & Ellee Katz
2018 Jayco 29MV
2018 Chevy Equinox