Dualie vs SRW benefits?

As dapperdan stated, we started out with a dually. Wasn't necessary with our first trailer, it was just a good buy when we were looking for a truck. That said, 3 years later, when we upgraded to a significantly larger trailer we didn't have to go looking for another truck. We're on our 4th trailer and 3rd truck, all duallies. Finding an automatic car wash capable of accommodating the dually can be difficult, but they are out there. Parking usually isn't an issue for me but occasionally I do find a parking lot with narrow or short spaces and I'm compelled to use more than one parking space. But that's not very frequent. Hope this helps.