Were you using trail control?
Interesting question. If the computer controls the brakes individually at each wheel, that would optimize traction. I wonder how close to 45 degrees you could get, say in Moab on that slickrock. I've skiied 45 degree slopes and it feels like a cliff. I could reach out and touch the slope with my hand and just standing took good edge control. I've seen tracks up and partway up slopes out near Moab that I guessed were around 40 degrees. I haven't been crawling in Moab for decades, I wonder if they've shut down a lot of those play areas?