Tongue weight is typically between 10% and 15% of your trailer's total weight depending on what you have loaded in the back and on the tongue. This would give your 8,500 lbs trailer a tongue weight range of 850 lbs to 1,275 lbs. With this in mind I recommend using a different system like the Blue Ox TrackPro Weight Distribution w/ Sway Control item # BLU27FR. This system has a tongue weight range of 1,000 lbs to 1,300 lbs which would be perfect for your Grand Design.
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