There is a long procedure to setting up the hitch correctly. Generally you will want about 6 links under tension. Do not worry about the ones hanging loose. You want the trailer level and the truck to squat fairly equally front and rear ( a bot more on the rear is OK). You want the WD bars to be nearly parallel to the ground.
You want about 6 or so links under tension to allow sufficient room for the trailer to turn without the the bars contacting the tongue.
Do you have the instructions for setting up the hitch correctly once the trailer is loaded? If not, they are generally available on the internet.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot