Long before I got my 80 in 2005, I accessed trails in Idaho and Utah with my mini-truck, and 4runner, (see sig line) that I cannot access with my locked 80. Both these vehicles were not locked.
Mostly, the trails were too narrow, or steep, slippery and wet for the 80, which is why I can't access them now.
The 80 is heavy, wide, and rubber slips in steep mud. A lighter narrower, more agile vehicle is better for this type of trail.
The 80 is a great expedition vehicle for wider trails, an amazing vehicle, really. Go from cruising 75 mph in comfort all day, to crossing creeks, and up snowy roads, all in the same vehicle, with everybody warm and dry.
Your unlocked 80 will serve you well for years, and the lockers are additional mechanical complexity, with the attendant maintenance and repair accociated with it.