Pacelines work when the guy in the front pulls off and goes to the back of the line to take a breather. When you figure you've done your share, pull over and let the new guy pull for a while. Hell, you might even make a new friend or riding buddy in the process.

But on bike trails and MUPs, that ain't the place to be running a team time trial. Too many peds, dog walkers, skaters, ninja runners, etc. wandering around cluelessly. Never ride faster than your guardian angel can fly, dude...