Ditto on the rest... using dolly 5+ years, never had a problem. Yes, 4-down is easier but we only tow 2-3 times/year and neither of our cars easily convert to 4-down towing so the dolly made sense for us at this point.
I've heard that some campgrounds make you remove the dolly and store it in a separate area while you are there, but I've never hit that personally. Nine out of ten times we drop the car out front, leave the dolly attached to the RV, and pull into a pull-through lot we've reserved. Back-in sites require more work but that's expected.
Wouldn't be without brakes and safety chains for the car. I carry a backup set of straps just in case...