There has been a good discussion about the power of different drive motors on the forum at the minute (http://ift.tt/1BZxQJk). A suggestion was made to do some tests with a tractor I had running and since I only have the JD 8360RT that was the only model I could test. I go over some motor specs and then test the power by pulling a loaded trailer along a flat gravel path and up a gravel incline. In the end I show you just what is necessary to get your model to climb the hill.