Just to throw my 2 cents in, my experience tells me that NDTs are TERRIBLE on hard, slick surfaces. From ’67 to ’69 I was in Vietnam and a deuce with NDTs could plow the mud if anything short of a Track Retriever could. In ‘73 I was in the Reserves, 244 Engr. Bn., Boulder, CO, and we took our equipment up in the mountains on a weekend. It snowed heavily while we were there and we could not get our equipment with NDTs down the canyons without sliding off the road. We left 12 trucks including 5 tons, deuces and an M123 10 ton tractor with a lowboy and a 290 earth mover, parked at the side of the road and piled into civilian cars to get home. I was driving a 5 ton with a D8 on a lowboy and I puckered up so tight I pulled 5 lb. of cotton out of that seat.
If you heard about our big fire last month, you know where we were working.
When I drove my M109 from Ft. Riley, KS to Denver, CO I went through heavy rain and it was squirrelly enough that I pulled into a truck stop and waited it out. I have been wondering if either putting a locking hub on a rear axle or actually pulling out an axle would help that.