dolly vs flat

I have both. Blue Ox system with a Jeep Commander and Demco fold away tow dolly. It all depends on what you want to tow. After 20 years with 4 down and 10 years with dolly it doesn't make much difference in time to hook or unhook. You do have the issue of storing the dolly at your rv site but it is quite easy to roll it to back of pad then fold tongue so that it only takes about 4 feet of space. Then when you are ready to leave you pull ahead 3 feet and hook the dolly then pull out and drive on and tie down. Dolly has surge brakes so you don't have to mess with brakes on the 4 down so that save some time. Really up to you and especially if you have a certain vehicle you want to tow. Last thing for me would be a trailer to tow vehicle on--then you have more of an issue with parking the trailer--although some vehicles ie rear wheel drive you have little choice other than a trailer depending on the tranny. Best of luck tom ps one advantage of the dolly with surge brakes ie Demco is that you can tow any front wheel drive you like including your mother-in-laws!!!!!