Keep in mind that the max tow values published for the truck are based on other types of trailers, not RVs. RVs add their own issues to towing (which the manufacturers don't talk about in their brochures).
You definitely want to make sure you are under the payload limit for the truck (which you are doing, so good on you for that). Another consideration is the size of the trailer. It's pretty long for a 1/2 ton truck and will likely cause you some difficulty controlling it.
For example, when you hit wind gusts, either natural or induced by other vehicles on the road - it will want to drag your truck around with it.
When considering a 1/2 ton tow vehicle, I like to make sure there is at least a 10% to 15% safety margin in all the weight limits, because these trucks just aren't designed for RV trailer towing (regardless of what the manufacturer/dealer tells you).
Also, remember that if you determined the trailer tongue weight using a scale, you're aren't accounting for the possibility of towing with non-empty waste tanks. You can think you'll never tow with them full, but things happen. You may have to leave in a hurry and dumping the tanks first may not be possible (for any number of reasons).
This is why I always estimate my tongue weight based on 13% of the trailer's GVWR.
When considering the payload capacity, don't forget the weight of the hitch - generally estimated at 125lbs.
This is a great place to ask questions. You can really learn a lot here.
Good luck.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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