I reallly don't think you need a WDH for your setup. The TC is light leaving plenty of payload. W/o a WDH, I have hauled similar load with my TC on board and never had an issue, always proper controlled.
That said, for proper setup of the bars, measure the front and rear bumper of the truck. Now connect the trailer and WDH bars, re-measure the bumpers. If the bumpers sag within 1" of each other with the rear sagging more, your bars are properly set. If the front does not sag within 1" of rear, than you need more tension in the bars. If the front sags equal or more than the rear, than you have to much tension in the bars.
I have found that I needed at least 6 links in the chain to allow enough for/aft slop to prevent the bars from being overloaded during turns.
Never buy a WDH that uses a bolt head against the main bar. With proper tensioning, the bolt head will sink into the main bar and readjustment required. Know from experience as this has happened before. Always try to use the style with the teeth on the side of the head and interlocking washers. Harder to adjust, but handles the load long term, especially when loaded heavy.
Above is all based on experience from hauling my first camper, a 30' TT with 1,000# tongue weight, puling it with a 92 F350 Crew Cab w/460.