Want to build me one?? LOL I am definitely no pro here but Kendall Strutt (who is a pro) did a seminar up at Waconda Boats this Spring that was very informative. He mainly slow trolls bottom bouncers with spinners or slow death rigs. If I remember correctly he always started out trolling around 1 mile an hour using his trolling motor and then experimented from there. I suppose your plate would allow you to run that slow with your big motor. If you are trolling cranks I would guess somewhere between 1 and 3 miles an hour, just depends on the day. I've read the speed doesn't vary the depth so much with the cranks but it does make a big difference on the action you get from them. Just my two cents worth and keep in mind, I'm relatively new at this, I'm sure others will chime in with much better info. Good Luck.