on page 20 of your owners manual (on line in post #7 here)
are pictures of the jacks...
left pic shows jacks fully down and the bars have zero tension...
right pic shows jacks tightened using the bottom of the 'barrel' as the reference point, which is what i've suggested.
they number the marks from bottom to top, so #1 is tigher that #3 right?
as the jacks are tightened marks 4,3,2 and 1 are drawn up inside the barrel...
is that clearer?
the not that jacks cannot be over tightened simply means that the spring bars and bushings and supports will not 'fail' if tightened maximally...
doesn't mean YOU should pull them all the way up...
that adjustment is determined just like any hitch with spring bars....
as i've already noted...scales or tape measure to 'level'...
however a nice feature of the haha is the infinite settings for the spring bars...we aren't limited to 'links' or increments of tension...
cheers
2air'
brow324...
there are many threads here on tensioning spring bars and lots of opinions on how to do it and to what degree of tension...
here is a link to my experience doing this at a scale...
http://www.airforums.com/forum...rs-17984.html?
the first post includes how my axle weights changed as 'marks' on the haha were pulled into the barrels...
but i may have numbered them the opposite of the haha manual...