We tow both ways enclosed trailer for the winter, tow dolly in the summer. For the winter we put our Smart and Goldwing in the enclosed trailer along with all kinds of other need items. In the summer we tow our Prius on the dolly. Advantages to both ways. I have never had a problem with the trailer finding a spot. When making reservations I just make sure to get a pull through. My overall length is 63 feet so I fit most spots. As mentioned you cannot back to tow dolly so you have to be very careful where you go for gas, sightseeing etc. You can back the trailer out of most any place you can drive it. There really is no best way to tow, it is up to each individual to fit your needs. I personally do not care for the 4 down, the car is getting more wear and you still have to cost of the towbar etc, and will it fit the next toad. Our Demco tow dolly and our Southwest enclosed trailer have served us well over the years and should be good more many more. Good luck on whichever way you end up going.
Dean & Mary (Retired U.S.A.F.) plus Purr
2012 Itasca Sunova 33C, 2015 Malibu LTZ w/Blue Ox setup & Brake Buddy