Take the truck to scales ready to camp (you, passengers, any stuff inside truck, any stuff in bed) and get it weighed.
Truck GVWR----7200# minus actual camp ready weight equals available payload keeping in mind added weight of hitch and available weight on rear axle (3650 RAWR) and the rear tire load rating
Then look at trailers GVWR and using a 15% of trailers gvwr will get you close to hitch weight (disregard 5th wheels------unless you want a very small light weight one. If so use 20% of 5vr GVWR to get pin weight)
Even though tow rating is 9200# you will max out on payload, rear axle rating, rear tire load rating and/or trucks gvwr before reaching 9200# tow rating
7000-7500# gvwr trailer