Thanks for the post , i do understand the dif and its very clear now.
It actually benefits me to have a camper and trailer weight on the rear axle of my truck as it balances out the truck weight distribution between its axles. This is what Andy was basically saying
,and is why i am considering a w/d unit with lb rating(lighter bars) less than the tounge weight of the trailer. I'm going to talk to a few more hitch dealers tomorrow, and I'll let folks know what they say.