I have about an acre of lawn that has a large, 15 degree sloped area. Am thinking hard about buying a Quick 36 with stand-on sulky. A commercial Toro 36 inch gear drive is my #2 option. I have a number of trees that I have to mow around and under. The lawn is also not perfectly smooth- it was never leveled so there are some bumps in it. Will a stand-on sulky work on a 15 degree slope? How about going up and down the slope with it? Is there a difference between the Toro sulky and the Quick 36 sulky in terms of durability? Thanks!