So I was at this property today that always reminds me of the people who say, "the Z-spray is no good on hills". It always makes me chuckle. This particular slope is so steep that if it were any steeper you couldn't walk up it. I manage it on my Z-spray Max without a problem. Here is the trick. You can't have more than a bag in the hopper. That's it. Full tanks, empty tanks, no matter. Bags in the trays or no bags in the trays, just keep less than 51 lbs in the hopper. 52 lbs and the Z-Max becomes a terrifying sled.