I addition to the above I would recommend you having your set up weighed.
1. TV connected to TV with WDH activated,
2. TV connected to TV with WDH deactivated.
3. TV disconnected and separate scale as TT.
You will get three slips from the CAT scales and you can enter your weights into this spreadsheet.
ClickThis spreadsheet seemed to change since I used it but it will tell you the weight of your tongue. If your tongue weight is too light you will get sway, that can be fixed by loading your trailer heavier in the front.