Tow Vehicle - Dual tires in back or single? Which is best?

Until you get into size and weight that needs a Dually, it's you choice.
When we got our first Dually we were only towing a 24' no slide TT, yep really over kill, but the dually was a deal to good to pass up plus we were debating moving to a 5er.
But on the flip side, we had been towing with a '95 Chevy 1500 and even tho it pulled OK, at the end of a days travel I was beat. With the Dually, towing became a breeze and I enjoyed the drives.
And when we were ready for the 5er we didn't worry about size or weights.