Yeah I agree. I assume the cooler wasn't getting enough air.
In the San Antonio press event video for the new RL, they drive the truck over a large mound of dirt that suspends the right rear tire above the ground. Sensors detect no traction and cut power so that the wheel does not spin. I'm wondering if your snow drift lifted the rear wheels enough to cause the sensors to detect no traction at those wheels and thus no power was delivered there. Also, I do believe that Sand (not Snow) mode on the i-VTM4 is supposed to lock power to the rear wheels...but maybe not if the system has overheated.
The front of the truck was definitely beached but the rear wheels were still on the ground.
I did a little experiment in my driveway after it had snowed a few inches. My driveway is a bit of a hill too.
In reverse if I punched the gas the front wheels spun and the front of the truck walked to the left (the driveway slants that way). If I roll on to the throttle and then punch the truck seemed to back straight up and accelerate. I stay this while knowing that throttle into drastically changes traction on any slick surface.
No satisfied with the first experiment I when of to access road near my house to you awd in get up dry (it's gravel). I started up the hill pretty slow in "normal" mode and then I got stuck. Thankfully I did not slide back into the road. So I changed it to "snow" because there was some and turned on the stuck vehicle setting. I easier into the gas and it started spinning but I kept it constant around 2500rpm and the truck dig in and climb the rest of the hill no drama.
I feel like these modern Awd systems need very constant inputs to figure out what to do.
