From the aliner manual
Your high quality coupler needs no adjusting or maintenance other than periodic oiling to ensure smooth
operation. All models use a coupler that receives a 2” ball.
Set the hitch height of the tow vehicle so that the trailer is being pulled in a horizontal position. The height
listed below is the optimal height after the tongue weight is resting on the hitch. Trailers must be towed
as level as possible for proper handling and weight distribution.
The Classic, Ranger, Scout, Sport, and Alite
Set ball height ~14” from ground to bottom of ball.
Set ball height ~17” from ground to top of ball.
Off Road and High Wall option
Set ball height ~18” from ground to bottom of ball.
Set ball height ~21” from ground to top of ball.
Expedition, Titanium
Set ball height ~19” from ground to bottom of ball.
Set ball height ~22” from ground to top of ball.