Not to be a buzzkill, but it looks like you have a missmatch that will never really work well.....I'd bet you'll be happier swapping one or the other off. You could spend a lot of time and money trying to make a square peg fit a round hole.
Scaled the truck with no water in the camper tank (looking to take this out as well, I have no use for it). Came out to be 1225 lbs. That was well over what the 4WC data plate and the options weight list I requested claim.