If I was doing this I would put two strings of perforated plastic tile up grade from parking area. dry ground will not move as fast as saturated ground. My two cents.
I had a person complain to me about my generator running, he was not very nice about it. I said I did not have generator, a truck by us was running his Thermo King unit. Bill
I do not own a diesel, but I seen this on the internet a number of years ago.https://www.google.com/search?lei=rVXgW6aFBZL_zgL0vpHgBA&q=6.7%20powerstroke%20cab%20removal&ved=0ahUKEwjTtbCbvb3eAhXnc98KHTQUAzcQsKwBCBIoAA&biw=1082&bih=458
I drove up once with a truck camper, another time drove down with a 25FT. class C. If I get in the area again I will drive it again. The view is great. there is a video of a semi truck descending, somewhere on the inter net.