Is your rig towing well? Does the TT rock back and forth while towing - which probably means it is too light on the hitch? Does the truck's rear end really squat down when you hook up - which probably means the TT is too heavy in the front?
Use all those numbers as guides for setting up your hitch. After you tow a bit, you might want to adjust the hitch and/or move some items around in the TT to put weight to the rear of the TT or more commonly more weight in the front.
You can buy special small scales to weigh your TT's tongue weight, or somewhere on these forums are simple instructions for how to use a basic bathroom scale to find the tongue weight (scale has to be offset, using a board/lever).
If your rig tows safely and you are happy with it, you probably don't need to adjust anything.