Should I install a WDH?

Yes, you need a WD hitch and almost as important, one that has built in sway control.  I tow with a half ton TV and my trailer weighs in at just about 6500 lbs when we are out on the road.  I have measured this a few times over the years as Washington State leaves their weigh stations open and functioning even when the sign says "closed"  I can pull in, position the trailer on the scales and look in the side door to see the measurement. 

I don't know anything about this hitch but it looks much like my Equalizer in design only with the scale on the ball.  Setting up mine took a few adjustments but it rides level, is not hard to hook up and provides a solid connection between truck and trailer.  I recommend a WD hitch, especially when you have a half ton.