I agree with the advice that you will need to go to a scale.
I just changed out my Andersen for a Blue Ox because the Andersen, according to Andersen, could not be set up to transfer the weight I have. According to Airstream my 2014 Flying Cloud 25FB came off the line with a hitch weight of 925 lbs. (Never mind that the Airstream spec for max hitch weight is 1,000 lbs.) I had the hitch weighed at Jackson Center with the trailer loaded as we use it: 1,252 lbs. Total weight is 6,500 lbs.
By-the-way, my Sherline weighed the hitch 102 lbs. (8.1%) lighter than the Airstream scale.
My drive axle weighed out as overloaded by nearly 600 lbs. According to Anderson Customer Service their hitch will transfer about 50% of hitch weight up to 400 to 500 lbs. So, although the Andersen has a lot going for it, it is not the hitch for my application. It would be nice if Andersen were a little more forthcoming about the capabilities of their product on their Web site and by customer service before the purchase.
As far as what you need to do when you get to a scale, I think weighing trailer and TV axles hitched will tell you if you are with in your TV's capabilities. Figuring out how much weight the hitch is transferring is more complicated, as noted above.