We have a 1999 17' SD and tow with a 07 Silverado Z-71 4x4 with HD suspension. Previously we towed with a 06 Jeep Liberty with 2.8L 4 cylinder diesel. The Liberty required a WDH at 300# tongue weight. The Silverado recommends a WDH at 600#.
I have weighted my trailer using my Sherline scale, and the tongue weight is just over 400#
I weighted trailers at a recent
fall rally and all 17' Casita's I weighted the tongues of were over 400#'s. (they were all Deluxe models with front bath)
I used and became accustomed to the WDH with the Liberty and so I use it on our Silverado. It makes a lot of difference in the ride of the truck and trailer.
I weighted our trailer before our yearly trip and each wheel was between 1400 and 1500 pounds. (1400+1500+400=3300#s total)
There have been many converts to WHDs over the years that have found and extolled the benefits of a WDH. Including one with a 3/4 ton van.
And using an anti sway bars is a no brain er.
Statements about one's tongue weights without having measured them should be ignored.
Joe