For me the regular automotive creepers designed to be low to fit under cars were too low to comfortably work under the airplane. Reaching the underside of the wings and belly of the plane was a stretch and not comfortable for long jobs. I got a Harbor Freight 63311 creeper and flipped the frame so the creeper sets 5” higher now my arms don’t get tired reaching up. It comes partially assembled but simple to take apart and flip a few parts to make it ride higher.

