Downriggers are the easiest method for running cowbells for lakers. A thumper rig produces but it takes what little fight there is away. If you run a thumper rig, I run 16oz weights off of a keel with a 36" lead to the weight.
I have a Cannon Telescoping boom off of an old Mag 15 rigger that came with the boat I just purchased. $20.00 local pick up in Hilton NY or I will have it with me at the Fingerlakes Trollers Flea market.