I am leaning towards getting an enclosed trailer for all of the obvious advantages over an open trailer. I have some questions about axles and size though. I think 7' is as wide as I want to go and am looking at lengths between 12' and 16'. Right now I only have 1 ZTR, but I could see a walk behind potentially joining it in a few months. At what point with weight wil dual axles be advantageous over 1? Do you guys have any advice on the lenth of the trailer? It will be stored in my driveway for now as well. Thanks in advance for the help.