I use an 18' Maxey steel deck with a 4' dove. The 4' dove is essential, if you want to haul a small car. On the tongue, I have a toolbox with a Warn 9K winch, a dump truck battery, and all the cables/tie downs/chains, etc. It's been fantastic. It is a tandem axle, but only has brakes on one. I'ts rated at 7k lbs, but weighs around 2,250 lbs, with the toolbox. The Warn winch weighs around 100 lbs, by itself.
We upgraded all the lights to LED, which is nice. I also upgraded the coupler to a 2 5/16 by Bulldog.
I've had several vehicles on it and it pulls, like a champ.

Go bigger than you think you'll need. There have been several times when a 20-22' would be nice, not very many where I wished it was shorter. It would be nice to have brakes on both axles, but I've never felt they were incapable of what I was hauling.
We upgraded all the lights to LED, which is nice. I also upgraded the coupler to a 2 5/16 by Bulldog.
I've had several vehicles on it and it pulls, like a champ.

Go bigger than you think you'll need. There have been several times when a 20-22' would be nice, not very many where I wished it was shorter. It would be nice to have brakes on both axles, but I've never felt they were incapable of what I was hauling.