Simplest would be the one with the metal base going front to back. The one with the rail and the plastic base if you wanted to add a sportman caddy.I didn’t think of andding a spacer,great idea.
Update, yesterday got the wild cabin out to look at the seat and wenched my back pretty good. Enough is enough. Called my son and asked for my Quick Flip 2 back and will be trading him on sat.Otters are great shacks if you have a wheeler or sled. Bad back and plulling by hand,they don’t play well together.I did mod. the Eskimo and got the weight down to 65 lbs. That and the angle of the front make it a lot easier to load and unload.