After looking over the new '16 t4r owners manual, the is no longer any wording included about the use of a wd hitch. Only that a sway control device should be used if more than 2000lbs and that the tt should be double axle if over 3k. The receiver itself is rated for 500/5000lbs.
With the trailers you list you shouldn't need a wd hitch anyway, just a sway device. I used to pull our 19' hybrid at 3600lbs without one. Tongue weight was 450lbs. I didn't upgrade the hitch until we went with the bigger trailer which exceeded the 500lbs tongue rating. (The old v8 was rated for 7200lbs) If you decide on a t4r, try it as is first before spending money on something you probably won't need.
