we have used two drift bags from cabels for years, I learned from an old charter capt. to tie one on each side of boat and drag the bags beside boat.
They have a 10' of 5/8 " line and run right beside me as I troll, I have to run the engine at 1000 to 1200 r.p.m. to get 1.5 to 2.0 mph and this also helps the old 350cid, 260 hp from fouling plugs. I'm on a 26' four winns and fish out of walnut in PA.
Good luck and hope this helps.