For what it's worth I just noticed Andersen has edited the installation instructions for their Ultimate Hitch. Now they call for retightening the cinch bolt after applying the trailer's full pin weight.
I don't have one, so can't comment on how much additional take-up there is after hitching. I suppose this need arose from folks installing the hitch on top of bed mats that may be compressing under load. If that's the case, B&W Companion owners may have the same issue with their drawdown bolt being loose after hitching. In either case, it's probably best not to have anything between the bed and the hitch except a spray-in bed liner.
Link to Ultimate Hitch instructions. Note step 4-5.
This additional step is not in the video instructions on their website. Those still follow the original instructions of torquing once and done.
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