I started out with a single 1st 7 years. when that rotted away, upgraded to a drive on tandem. The farther you plan to tow, the more you will be glad you have a tandem. Handles much better and like Randle, I lost a wheel on my single once, always glad now to have the load distributed over two axles and four tires and wheels. Pull with a Chevy Astro, no brakes, no problem. Oh Yea, I also lost a wheel on my tandem (rusted axle) backing down the ramp a couple of years ago... was half tempted to still go fishing and worry about it after, didn't but instead of being stuck at the ramps I just threw the wheel in the Astro and drove back home on three wheels.
High_Diver