2003 GM 2500 HD 4x4 I am hooked up on the juice with attitude. I was pulling my boat the other day in tow/haul mode and The Edge was on number 2 witch is listed as tow setting. The display on my unit is set so I can monitor trans slip, Is it normal for it to slip 6-12% in top gear locked? The boat I was towing only weighed 1000 lbs. I should add I was only doing 57mph uphills when it would slip. The hills were about 5-10% grade. Doesn't the juice with attitude let you know if there is a definite slippage?