Is there an official Forest Service policy regarding recovery of a vehicle like that? I expect that they wouldn't support a private effort when there is a risk of an oil spill in a creek. The effort to recover the ATV on Argentine pass a few years ago was sort of like this but there the vehicle was clearly abandoned an posed less risk to those who volunteered to try to remove it.
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln