M_Boats: Montgomery 15 trailer question

Talking about the 2000 year vintages. What is the ideal height of the trailer ball from grade. New Outback and trying to see if I need to reverse the ball on my extension. So anybody that has a boat on trailer if you can confirm what is the tongue height off grade that makes it a nice straight connection to the hitch of the car. Thanks Smiley M15 #616 . Karen & Smiley Magoo252@comcast.net <mailto:Magoo252@comcast.net>