Back in the day, we geocached with a pair of yellow Garmin GPSrs. When you would sync the Garmin with the computer, it would abbreviate the geocache name to just eight characters. Mr and Mrs Robriki were looking for a cache under a bridge (GCPCT1, near Greenville, MI) when Mrs Robriki mentioned the joke about the name of the cache. "Its called 'Troll's Extra Key', get it?" I looked at my GPS and just saw the abbreviated name, TROLLSEX. Gosh that was funny! 
Difficulty because of potential poor signal and there may be other trolls at this location (hopefully not doing youknowwhat 
) Try waiting them out by getting a couple stops of my non-sequential Adventure Lab "Unity Bridge Troll Tour'.