If you have 3 wheels you can roll the Stowaway towards the receiver tilt the front a couple of inches on the rear wheels so the hitch is partly inserted in the receiver hole. Lift the stowaway and push it into pre-marked location.
The third front wheel mounted on the Stowaway hitch was optional, I am not sure if they still sell them. Third wheel was very helpful, but I only attach the stowaway completely empty.
If you are thinking of mounting a loaded box than hiring two muscle man will work well.