I use a trimmer trap sulky, I love it, the wheels make no marks in the grass, they are inline with the mower tires. The deck is great and doesn't build up a lot, very easy to grease and comes with a built in feature to lock in upright.
But most people cant use the 2 wheeled sulkies in reverse, its really not hard. For straightaways, just stiffen your legs and make adjustments by pushing with you feet on the front. And to turn while backing up, its just like a trailer, and who in this industry can't back up a trailer