I've been successful up to approx. a 12" difference front to rear. Certainly, start out with the wheel chocks, but with your dramatic slope, I think the wheels will leave ground well before the unit is level. I THINK you'll be okay but do raise it incrementally and be careful.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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