Here is the regulation for Canyonlands;
I have included the wording that mentions AWD vehicles and a link to the Superintendents Compendium.
Each NP has a Superintendents Compendium, in the case of Death Valley NP it is very helpful to make sure you dont camp in a closed area.
36 CFR 1.5 Closures and Public Use Limits
Roads Closures and Restrictions
The following roads and parking areas are closed to all vehicle traffic or restricted as noted except for those on official government business:
The Needles District
- Dirt road leading from paved road to water well.
- Road located approximately 100 yards east of maintenance area leading to generator building.
- Dirt road leading south from loop road, located approximately 200 yards west of the ranger station.
- Dirt road off Salt Creek access road approximately 200 yards from Wooden Shoe Creek.
- Road to residence area.
- High clearance four-wheel drive is required on motor vehicles travelling on the following roads: Elephant Hill, Salt Creek, Horse Canyon, Lavender Canyon, Lockhart Canyon, and Colorado Overlook Road.
Island in the Sky District
- Road to maintenance and residence area
- Dirt road near Grand View Point leading from paved road to radio repeater shed.
- Dirt road near Island in the Sky Campground leading to a maintenance storage/supply area.
- Dirt road adjacent to Shafer day-use parking area leading to a maintenance storage/supply area.
- The Shafer day-use parking area is closed from one-half hour after sunset until one-half hour before sunrise.
- High clearance four-wheel drive is required on motor vehicles travelling on the following roads: White Rim Road.
The Maze District
- High clearance four-wheel drive is required on motor vehicles, travelling on the following roads:
- From the North Point Trailhead to Panorama Point and Cleopatra's Chair;
- From the start of the Flint Trail and beyond to the Golden Stairs, Maze Overlook and to Waterhole Flat;
- From Waterhole Flat to Teapot Rock on into The Land of Standing Rocks and the Doll House.
All park roads and lands are subject to temporary closures as indicated by signs or other means of notification during periods of adverse weather, natural disaster, emergency, or implementation of management responsibilities.
Invited guests of employees residing in government housing may access administrative roadways in housing areas.
Definitions:
High Clearance Four-Wheel-Drive (4WD) Vehicles
A Jeep, sport utility vehicle (SUV), or truck type with at least 15-inch tire rims and at least eight inches of clearance from the lowest point of the frame, body, suspension, or differential to the ground. Four wheel drive vehicles have a driveshaft that can directly power each wheel at the same time and a transfer case that can shift between powering two wheel or four wheels in low or high gear. All wheel drive (AWD) vehicles do not meet this definition.
A document that lists the special designations, closures, permit requirements, public use limits, and other restrictions made at the superintendent's discretion.
www.nps.gov
@Waltzing Matilda JT you might have some insight into what the Compendium is.