"I can't figure out, other than the suspension on the truck's limitations why I need to figure the camper weight in on the weight distribution system."
The added weight in the bed means more weight to distribute (rear to front on the truck) to have the truck ride somewhat level and to accommodate the added stress on the bars.
If it was not a weight distributing hitch it wouldn't matter.
Here's guide that might explain it better ...
http://www.ebay.com/gds/Weight-Distributing-Hitches-Buying-Guide-/10000000177633611/g.html
