Restating in a slightly different manner what others have said:
The bars are under great tension and still lever shift the weight from the tongue to the TV front wheels and to the TT wheels. Instead of using a pry tool as the primary installation tool, you really should lift the TV & TT connection at the ball using the tongue jack. Then once the chains or just the bar on the frame platform is installed (using the tool if a little assist is needed), lowering the TV & TT using the tongue jack places a great deal of tension on the bars. IF you do not lift the tongue during install, you will discover it takes a great deal of strength to get proper tension on WDH bars to push down the front of the TV properly. From my humble experience, with just my Husky Centerline 400-600# bars, installing the bars without lifting assist either requires a LOT of effort or is improperly, weakly loaded.
