I am looking for a way to change a package unit that is inside a 3' high brick wall. I need something that can lift the old unit out and a new unit in, without hiring "grunt-labor". I was originally thinking about something like the Toro Dingo walk-behind loader, but I don't thing it will handle the 400-600 lb package units that I am looking to install. The load rate of the Dingo with forks is only 335 lb. Any suggestions on how to get over the wall?