JBarca wrote:
OTOH If after you had adjusted the hitch as described above;
And you add extra weight to the truck bed behind the truck rear axle which is a large enough weight and or far enough behind the axle to lower the back of the truck, this can change the hitch head angle relationship to where it was originally adjusted to and add a level of tension to the WD bars. How much tension rise in the WD bar depends on how much the hitch head angle changed.
If the downward force exerted on the A-frame by the WD bars is increased, the load on the TT's axles will increase.
Since the weight of the trailer has not changed, and since the trailer axles now are carrying more load, the vertical load on the receiver must decrease by an amount equal to the load increase on the trailer axles.
That is the only way I can figure (right now at least) why they feel you need to upsize the WD bars. If there are other ways, please point them out.
I have no idea why they feel you need to upsize the WD bars. Perhaps they'll change this recommendation just as they have changed their recommendations for amount of front axle load restoration.
Ron
