They are patrolling, I imagine they check what ever they would like.
I have seen them a couple of times in the High Uintas.
I'm sure NFS/NPS in Colorado patrols their back country, and I'm pretty sure you are aware of that.

Alaska Backcountry Rangers
Yosemite Backcountry Rangers
Colorado Backcountry Rangers

Let's Go Brandon! FJB