Above posts are accurate.truck is on level ground then level trailer as previously stated.
I first used an adjustable hitch but found a lot of knocking and some movement when towing. Then went to a solid 5 inch drop for my truck and the noise and clanking movement at the hitch disappeared. Any marina,if not your dealer should look at it for free. Make a habit of this:the level, wiring,coupler,crank down jack,chains are being checked at every hook up,(Besides other stuff) I have the marina I store it at check it along with the coupler every year takes about a minute.
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