Slabseeker, I troll for crappie off and on all summer, but I always pull crank-baits (Bandits). I have a rod holder built for the back deck of my boat that will hold up to (4) rods. I set the trolling motor to run about 1.5 MPH, and check the speed with a GPS. It's a pretty simple system and I can usually catch a decent mess of crappie.
I was in the Toby Tubby area this morning and tried trolling for the first time this year. I caught 10 decent fish in about two hours, it was sorta slow. I usually don't keep over a dozen fish, I just don't like to clean more than that at one time.