I have a very steep driveway down to my barn where we store our 33' fifth wheel, about 10' of elevation change over about 75' or so with the steepest being around 11-12 degrees. I knew this was a challenge before we poured the driveway but at the end of the day I have a good 4" clearance at the lowest point (bumper of fifth wheel) backing down the driveway. The key for me was a smooth fluid surface, in other words NO sharp bends. I have a flat surface in front of the barn for when it's parked outside as well.
Dan
