The height of the ball is determined by level tongue height. If I recall Reese adds a small amount to that measurement. There is a chart in the Reese instructions for tilt. Measurement of end of trunion to ground depending on height of ball. Then when you connect TT & secure hitch raise the tongue with jack about a foot. Then connect trunion bars. Makes connecting much easier. Make minor adjustments as necessary to make your vehicle level. I had a Reese dual cam with the trunion bars. Also make sure you have the correct weight trunion bars depending on tongue weight.