While I agree that bigger is not always better, the WD hitch DOES need to be rated to transfer the largest hitch load the trailer can produce.
In my opinion, the trailer weights for HiLo as shown on the "specs" are a bit lower than you actually see in practice. I would use the trailer's max gross weight and multiply it by 0.15 to get an estimate of the tongue weight the WD hitch has to handle.
So, if your trailer has a MAX gross weight of 6000# (what I just found it could be for 24Ts in the sales brochure I have for the 2006 models), it might have a tongue weight of 900# when fully loaded. I would use a WD hitch rated at 1000#.
My 1707T actually had a tongue weight of 630# with a full fresh water tank and full propane tanks. And, the trailer itself was about 3820# in this configuration (almost at MAX gross weight). So, MY tongue weight was actually 16.5% of the total weight of the trailer. I had the axle moved forward 3 inches to bring the tongue weight more in line with what it should be. And, I have a 600# WD hitch, so it was potentially overloaded in the "factory" configuration.
- Jack