the slope in this case is not the ground but the gable end of the high tunnel. what i usually do when the ground slopes is put something under one leg, like a piece of wood, to level it. i guess the same would work if the other end is the slope. anyone have any better suggestions? when i first put up the high tunnel i rented a 10' step ladder. 12' would have been better. but i would prefer getting by with my extension ladder. i need to put the second layer of poly on it.