Fill your truck up with all the stuff you take camping. this includes folks, fuel, firewood, etc. then go down to the local CAT scale and weigh it. Now you take those numbers and subtract from GVWR to get your max rating. you can also subtract actual rear axle weight from GRAW to know what your available pin capacity is. just looking at cab stickers and owners manuals is just farting in the wind until you have some real world numbers

airbags are just a bandaid for an overloaded situation

Barney