I have not heard of any liability issues. When you adopt a trail, you are agreeing to perform maint. tasks for the agency, and do it in accordance with their policies. There should not be any liability issues for the group doing the work.
1981 Cherokee W/T, 360, T-18, Warn 8274 in custom bumper/deer strainer (tested and approved)
1988 Cherokee 4 door, 3" Rancho lift, custom sliders/steps, custom roof rack, custom camo paint, custom camo headliner, custom bumpers and Warn 9500 HS, 31-10.50's
Only 31's, but can drag self with either rig
BLM John Day/Snake RAC-OHV Representative
Wolfpack 4x4's - Region 5 - "Cave Lupum"
VP- Outcast Land Use Review Team