Attached is the trailing towing chart from Ram for your model year. Scroll down to the last couple of pages and find your exact crew cab model configuration and then look at the weights. Not to be a "rain on your parade" type of guy while you're on an epic trip, but anything outside of the manufacture weights and you could be liable both financially and punitively if anything happens. I hope you have a fun and safe trip.
That chart is not something you should ever go by for payload OR base weight numbers - unless you have a base truck with no options, ie. stripped no options Tradesman.
At the bottom of that chart in the footnotes is good information to know also.
The payload and base weight are way off from most trucks that people own - any and all options and addons will decrease payload and increase base weight.
Add higher model over Tradesman, running boards, bed cover, subwoofer, etc - will reduce the charts payload number and increase the base weight.
The door sticker will account for all option upgrade weights for your truck as it came from the factory and list your trucks payload and weight number as it shipped.
Same applies if you add anything after purchase, hard cover, skid plates, etc - that weight must be subtracted from the payload and will increase the new base weight.
All of this additional weight will limit trailer weight and also so you don't exceed GCWR, GAWR, GVWR, and payload.
Best thing to do is to run the truck across the scales in as traveling form fully loaded - this will be your new base weight for that trip.
IMO