People have strapped long kayaks and such to their Element roofs, so I don't know why a hang glider wouldn't fit up there. Does you Element have a factory or aftermarket rack? Either should work, but IMO a Thule or Yakima will be a little better thanks to their straight crossbars.
I was recently at Jockey's Ridge for a weekend hang gliding event. I saw several Elements in the parking lot that transported gliders. One was from Florida---a pretty good distance from the Outer Banks of NC.
It looks like the "standard" method is to use a long extension ladder tied to the roof racks (after market racks seemed to be the most common of what I saw).
The ladder is light weight and offers good rigidity to support the kite. I saw several small station wagons with the same sort of rig--but most of them had a trailer hitch and had a vertical support mounted to the hitch receiver.
Weight should be no problem...just be sure to tie both ends to the car.