When I switched trucks I tried to do a "pre" set-up on the WDH.
Ultimately...it took putting the truck/trailer on level ground, measuring, etc... in order to get it right. Then asking a local mechanic to tighten it for me, because my little torgue wrench don't go that high.
Keep in mind you will be picking up an empty trailer, but will be towing a loaded trailer. Get it close, get it home. Load it up, then make the final adjustments for a good towing experience.