Adjusting Reese Dual Cam Settings

[Mark]

OK gang here is my question:

This is my first year with the Reese dual cam. Once a year I tow about a 15-mile distance on I-80 in Central PA to attend a family reunion. I fill up with fresh water at Parker Dam State Park, then head onto I-80 with water in the rear tank.

So, I know my tongue weight will be light and change the geometry of the weight on my TV. I think I should go from five links hanging to four.

My idea is that the weight on the tongue will be lighter because of all the fresh water, so therefore I need to transfer less weight onto the truck right?

I have towed the trailer with water before, but not on I-80 with trucks screaming by.....