I have a Chevy Colorado ZR2…
I have a Chevy Colorado ZR2 and a Subaru Crosstrek PHEV which has the increased lift and XDrive. In the past I have owned Jeep Cherokee and Liberty and a number of Ford Superduty 4x4 trucks.
The NPS apparently doesn't really understand how 4x4 and modern AWD vehicles work.
My 1986 F350 Diesel 4x4 had the standard 2 speed transfer case with high and low range. It did not have limited slip or locking differentials so was fairly easy to get stuck in mud or slippery surfaces. Same with the Cherokee. The Liberty did have limited slip on the rear, but also had full time 4x4 labeled AWD along with low and high. The Subaru even without XDrive applies power to the wheel with traction. You can see videos of Subarus with 1 wheel on the ground still moving forward.
The ZR2 which is VERY 4x4 has an automatic 4x4 position that senses slip and engages axel as required more like the Subaru than the F350.
Subaru isn't the only one with very capable AWD and not every 4WD truck can get out of 1/4 inch of mud. Ask me how I know.