I would recommend the WD hitch, my truck is a Dodge 2500, the trailer tongue is 465 per brochure dry weight specs. As bikendan stated, the loaded for camping weight is much more.
Either way, when I hitch up before the WD bars are connected, the truck drops maybe an inch, when I attach the WD bars, the truck is back to normal. So really there's not much weight that I am redistrubiting.
The difference is when driving, the WD bars eliminate the bouncing such as crossing over cattle guards, rough roads, asphalt to concrete at a bridge, train tracks, anywhere the truck could bounce a bit. I have driven it both ways, with and without the WD bars, it is like adding a high quality shock absorber to the connecting point.