If possible try to find out what your actual loaded tw is before you buy a wdh. You probably are in the 650lb or so area based on the 5k lb loaded tt, but a lot of us have been surprised at the scale results.
A wdh w/ bars rated higher than 1k lbs is probably overkill for your set up.
Also consider the Reese SC wdh. Very similar to the Equal-I-Zer 4 way system, and a little cheaper than the Straight Line system. The Reese hitch head (both models) does offer a little more fine tuning adjustment vs the Equal-I-Zer hitch head, and the ability to swap out the wd bars for different rated ones, but you can't go wrong with any of the 3 systems.
Good luck!
