The (so called) WDH is fairly popular with folk hauling 2 horse trailers, I figure most of them probably have close to 6,000 lbs gross weight back there.
This is a regular week-end thing for many of them during the show season and most of them that I know are going up to 100 miles each way to day shows, a couple of hours.
As to WHY it is the thing for them - well, despite my own lack of fondness for Wdh I have to admit that they DO take out a LOT of the fore/aft pitching that happens with tag along trailers, especially bad when you are running close to the max recommended tongue weight and the steering is kinda light.
They believe that it takes out a lot of that same fore/aft pitching for the horses too and they LUV their horses so much that they'll do more for the horse's comfort than for their own.
As to why I say it is "so called" - - the name is a misnomer, it doesn't distribute the WEIGHT, that stays exactly where it was,
it would be more correctly called a LOAD re-distributing hitch.
Anyway, if it is a LONG time since you tried one it may be worth re-visiting them.
In particular the ability to set an initial angle for the spring bars in some of them removes a lot of the fuss with getting ball height "PERFECT".
The thing that always bugged me was trying to get the right ball height with the right drop angle for the spring bars so that they had the right ground clearance - that was DECADES ago, I think you'll find them a lot more user friendly now.
At least I found that to be so with the most recent Reese hitch that I bought.
As far as geese go; sure I would rather pull my 40 ft horse goose trailer around than the iddy biddy little 2 horse trailer, it tucks in behind the truck better, is less prone to side winds, rides better and on a long haul uses slightly under 2% more fuel despite the added weight - I'm Not pushing two vehicles through the air resistance and at highway speeds that MATTERS for vehicles with the aerodynamics of a barn.