Made it about 1/2 way through posts, but. Loaded tires can be good, but they are loaded, and can't be quickly/cheaply unfilled/refilled, so a 6 ft box blade might be a better choice and or wheel wheels.
Since you mentioned slopes and erosion, you can be 100% good on a slope, and a tire hits a fairly minor, hidden, wash out, and go from stable to not very fast. Let's say 15% cross slope, run into a 8" wash out with the down hill tire, and suddenly your at 29%. Not trying to worry you, just be careful.