simply put...no
and no, the Expy won't really notice the 500 lbs tongue wieght. It is a 8 passenger vehicle and has the rear springs to hold that sort of weight.
I'm 280lbs myself and my EL Limited doesn't even squat a tiny bit under my weight when I crawl into the rear.
Hopefully the trailer has e-brakes...at least surge brakes at the very least.
a WD hitch would be nice...but not for that weight. and a Brake controller would be nice if possible