cant make heads or tails of your post in regards to weights because you are going by GVW I assume...
What you need is individual axle weights from the scales. Front and rear. The compare them with the axle weights on the door tag..
Subtract the two and that's your payload left period.. Payload for TW or pin weight plus passengers, fuel and gear,,
Anything else and your just guessing.. If you want to stay under GVW thats fine but you may have a lot more capacity...
Once you get your payload info you will know exactly what you can tow...