I am really wondering more for the sake that I hear on here so often people demand we run a WDH. One big reason for their demand is the "unweighting of the front axle". I ran quick numbers and do not see it for a small or medium trailer, even for 600 lbs, which might only translate to 200-250 lbs unweighted off the front.
The bigger the truck the bigger and heavier the motor and trans too.
My current truck is a Frontier with 4WD, not to be confused with WD.
So the number are small compared to my 3/4 ton truck, but this "small" amt of weight does sag the rear quite a bit. I was surprised that the tongue was only 350lbs given the sag. Conclusion, I do need either WDH or bags. Sag cannot be. Running the WDH makes the truck drive and ride a lot better for sure.
I might weigh again just to double check everything but dont expect numbers to be much different if at all. I was surprised at the low weight bc everything is in front of the axle - AC, batteries, electrical, solar, water tanks, sink, kitchen, fridge, propane... The couch and cabinet do straddle the axle and I keep the spare at the back, but thats about it.
So, there ya go. If you ever thought 350 did not warrant a WDH now you know it does on some trucks at least. I even used it on the big 3/4 ton long bed with same trailer loaded more evenly. It just rode better with WDH. Makes me think I gotta have the weight wrong.....
Also, affect and effect is worth researching.