2wd low sound like a good idea but in real life isn't very useful.
I would use 2wd in a manual lock 1st gear in that situation...if you get wheel spin use 4 hi
In the ram w/ 8 speed reverse is about the same as 2nd gear, a stupid idea for a truck, but this transmission is also widely used in smaller performance cars also so was probably an oversight. Low range helps out tremendously. Backing our boat up the driveway sometimes has the tach at 2000-2500 rpm and just crawling up the driveway, in 4-low it almost does it without touching the accelerator. Wheel spin/traction is not an issue but gearing is definitely lacking.