Congrats on your new rig and welcome to the Forum...
"Dealer said we would be fine," are famous words and often famous lies.
4800 lbs dry will be easily 5800 lbs with options and loaded for camping. Since it's a bunk house, I assume you have kids. That means more stuff and more weight.
Also, 3.08 rear end is not optimal for towing. You will definitely need a trans cooler. And, beside the towing capacity you need to look at the PAYLOAD capacity of the Tahoe. I am guessing that loaded with family, gear, and the loaded tongue weight of the trailer, you will be close to or over that number as well.
Stick with it. We all (or at least I did) have to go through the learning curve.
