You can make your own off road base with a semi-large square piece of plywood- You can use 1-3 bolts to hold it on to the Hi-lift base-
This will allow a bigger foot print to minimize the hi-lift from sinking in. (throw the spare tire on the base for extra weight too)
Definately open the doors when using the hi-lift on the sliders.
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Also make sure you block the opposite tire to keep the Xterra from moving - use the spare or blocks of wood