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I would think the handle is bent the wrong way on an appliance dolly.  It wouldn't lay flat and it would drag the ground making it harder to move.  If only the verticle members are running on the ground, it should glide right along.  I could be wrong.
My 2 sons and I  have used a small dolly purchased from Home Depot to get from 50 to up to 400 (moss and lichen covered ) pound boulders  dug out halfway out  of the ground from the Sierra Nevada Mountains up,down, sideways and along the rocky ground, load them into a 3/4 ton pickup using 2-2 x 6's as a ramp and then position them for retaining walls up to 3 1/2' high x 47' long along 2 sides of the house. As well as along the 120 foot driveway and beside it and the creekside and  landscaping around/ next to 72 Redwood trees on my 2 acres of grounds around our house.   Took about 10 months, 117 trips  and aproximately 100 tons in all. We also used it to move and position 48 - 8' high  x 12' wide all steel side panels and 48- 26" x 30 foot steel roof panels , each by 20-70 feet, to build my Mare Motel barn.  So I would hazard to guess that lifting one end of a chicken tractor by 2 inches and moving it about 8 to 10 feet that one would work for a chicken tractor as well.