I was hoping you'd chime in. Thanks for the detailed info, as always!Hitching Up
To be clear, there isn't a need to ever use AHC "off". There isn't necessarily a preferred position (L,N,H) to hitch from. Any can be used. Though obviously you'll need to have the ball come from under the coupler so the lower AHC position is probably more useful.
With WD hitches, instead of lowering the coupler onto the ball, it's preferrable to use AHC high to jack the ball into the coupler. This sets things up for the next steps: latch the coupler, then engage to WD bars. As mentioned, being in AHC high and/or tongue jack in a high position, will allow engaging the WD bars with the least amount of effort, and potentially without tools depending on the specific WD hitch.
Setting Tension
This part is a bit tricky as you can't use the common measuring of front fender heights to establish Front Axle Load Restoration (FALR) tension.
One of the first things to do is to set ball height. (Important for stability but also plays into WD bar angle/tension) This part is easier as AHC is constant height in normal position. You'll want to get the trailer level on its own, and get a measurement of the coupler height. Setup the drop hitch to have the ball at this height. If somewhat in between, slight nose up of the trailer is preferred over slight nose down.
The next part of setting WD bar tension will be somewhat done by judgement. Overtime, you'll develop what is right for bar tension based on experience. Ideally you'll cross check this on the scales. If the setup or steering feels squirely or sways, you need more tension. Too much tension, and you'll know it too as it'll feel like the nose if forced down over road gradiants/bumps. The car should feel very stable and fairly neutral in attitude.
Back to setting tension, get vehicle in AHC H or jack things up pretty high with tongue jacks. With the type of bars in the picture, you'll lash up with some tension where it should require the leverage of the tool. Draw up the tongue jack and have AHC self level. You should see some preload and bend in the bars. If it's straight, there's probably not enough tension. If it's too curved, probably too much.
Congrats. Good luck. And pictures!
Pictures when/if I actually buy the trailer. Just going for a look-see this Sunday, then potentially working out a deal and picking it up the following weekend. Looking at a 2019 Outdoors RV 21RD.
Is this not backwards? Slight nose down would shift more of the trailer weight forward, resulting in more tongue weight and better stability. Or am I missing something?If somewhat in between, slight nose up of the trailer is preferred over slight nose down.