Things to keep in mind, for your truck / trailer shopping.
1. The RV sales person has no idea what you're going to load in the trailer. Only thing they know for sure, is unloaded weight of the trailer, and advertised "max tow" weights for various truck models. They may try to sell you something that puts a stretch on your truck's capabilities, before you load it with camping gear. They'll tell you the trailer has XXX lbs of hitch / tongue weight. Don't count on that number for your calculations. Most likely, when the trailer is loaded up for camping, it's actual tongue weight will be a couple hundred pounds heavier. Tongue weight is not a constant number, it fluctuates during every trip.
2. Advertised "max tow" weights are an "UP TO" number, and they are calculated without passengers or cargo. Depending on suspension, cab configuration (single cab, extended, crew cab), drive train, power train, installed options, etc, every truck has it's own payload and true "max tow" weight. You need to check the numbers on each and every 1500, 2500, F150, F250, etc.
3. There is a tire / loading sticker (drivers door jamb) on every truck. On that sticker, there is a number for "max occupant / cargo weight" (AKA payload). That number is that particular truck's capacity to carry the combined weight of aftermarket accessories (bed liners / covers, bed caps, etc), people, pets, car seats, luggage, entertainment systems, a weight distributing hitch / anti sway equipment, and tongue weight from a trailer.
4. Part of the manufacturers calculation of max tow weight, is payload used to carry hitch equipment and tongue weight. When you use some of the payload for people and stuff, you no longer have the payload to support that max tow weight. It's very common to run out of payload, long before you get close to towing that max weight.
5. The closer you get to being at or over your weight ratings, the more unpleasant your towing experience will be.
6. Average trailer load (dishes, pots and pans, camp chairs, BBQ equipment, bedding, groceries, water, etc) is 800 to 1000 lbs. Depending on how close these things are loaded to front of the trailer, the more they add to tongue weight.
7. Tongue weight should be at minimum of ten percent of loaded trailer weight. Average is about 12.5 percent. Not enough tongue weight can cause trailer sway.
8. If you know the payload on a particular truck, you can subtract the combined weight of your passengers, cargo, and 100 lbs for a distribution hitch, and what is left over is available for carrying tongue weight. You can then divide that available payload by .13, and that will give you a ball park number for LOADED trailer weight that would put that truck near its max capacity.
9. When you go trailer shopping, look at the GVWR of the trailer, not the UVW the sales person is talking about. Multiply the GVWR by .13 to get an approximate loaded tongue weight.
18 Nissan Titan XD
12 Flagstaff 831FKBSS
Wife and I
Retired Navy Master Chief (retired since 1995)