I need some help with a new BedShaper by Little Wonder. I purchased the unit second hand and it works great on flat surface. It really does a nice job of edging and cutting/shaping new beds. It has plenty of tranction and pulling ability when the blade is in the ground. Similar to the tines on a rototiller, the blade helps pull the unit along. But, my concern is that it does not have enough "umph" to climb small grades. (when blade is up) It won't even climb the gate into my trailer. Since the unit is second hand, I don't have a maintence manual. Anyone out there face a similar experience? Any ideas on how to adjust or fix this problem.