Welcome aboard! You are going to love it here. And this is a great place to put your introductory posts.
As for hitch weight/ tongue weight. The dry (unloaded) hitch weight is somewhere well north of 300 pounds, as I'm sure you know. Once you have added factory options like air conditioner and awning, and then added all your own stuff, that weight increases, often well beyond 400 pounds. But I don't think you will experience 700 pounds of hitch weight. About $10 for a quick stop at a CAT scale will give you a real answer.
Please don't buy air bags until you read a couple of the tutorials in the Trail Manor Technical Library. The entrance to the library is at
https://www.trailmanorowners.com/for...splay.php?f=42
and there is a lot of good stuff in it, especially for a new owner.
I'm thinking particularly about these tutorials:
https://www.trailmanorowners.com/for...ead.php?t=2616
and
https://www.trailmanorowners.com/for...ead.php?t=2922
Bill