you've made one of the #1 newbie mistakes, believing what the dealer says!:E
never believe a work that comes out of their mouths. always check with places like this before you close the deal.
did you look at the trailer's actual yellow sticker weight, cause you're quoting the bogue brochure "dry" weight.
it probably weighs 6400-6500lbs. on the yellow sticker.
which means that loaded for camping, it'll be over both vehicles' max tow capacity and that's rated with only a 150lb. driver in them.
the trailer's GVWR is over both vehicle's max and it doesn't have much of a CCC for a trailer that size. which means you'll easily get to the trailer's GVWR when loaded.
and that's not even talking about actual hitch weight and a 1/2 vehicle pulling a 30'+ TT.:(