Do not take advise. Google "Ford towing calculator" put in your vin and it will tell you exactly what you need to know. Good luck
Well, not exactly.... Ford's definition of "trailer towing certification" is not the same as "Owner's experience with travel trailer towing"... Why? There's significantly more to towing a travel trailer/fifth wheel than just weights. Ford uses SAE testing procedures to certify their "max trailer tow certifications"... SAE procedures require a 14, 16 or 18' basic cargo trailer or a 20' gooseneck trailer, loaded with the appropriate "dead weight" (usually concrete blocks or other heavy, stable weight) properly positioned on the trailer to achieve a specific tongue/pin weight. Test conditions require no more than 12MPH winds during the test. There is NO tall, flat sidewall to catch crosswinds or large vehicle "bow-waves" and no "variable tongue/pin weight" that changes based on loading, having a full black tank or full/partially full fresh water tank and DW's "18 pairs of shoes". Also, the SAE procedure doesn't consider or account for a 30+ foot long "box behind the truck" when building those "tow test environments"....
The SAE standards are based more on performance (acceleration, braking, parking brake performance etc) rather than on "steering wheel feel" and non-stressful towing. There is no "true comparison between the SAE test results and what a driver will experience behind the wheel of the "test vehicle towing a large RV trailer"...
As an example, the "Launch on grade" test requires the rig to move forward 16' on a 12% grade five times in a 5 minute time limit. That might mean something to someone, but bears little to no relationship to towing up I-70 from Denver to Grand Junction on a summer day, through the passes with downhill braking, uphill climbs and crosswinds in the canyons. Plus, towing a 16' cargo trailer bears no resemblance to towing a 32' Passport through that trip on I-70. Plus, I don't know of anybody who tries to climb the interstate to the Eisenhower Tunnel and just west of Silver Plume stops in the middle of the road, "guns it for 16', waits 30 seconds and repeats that for four more cycles".... The SAE test and certification is not "real world RV towing"....
So, while an owner can get some information from websites such as the ones you recommend, someone needs to remember that all trailers are not created equal and travel trailers go far beyond a flatbed trailer when it comes to being subjected to "adverse towing conditions and reasonable towing requirements"...
You can view the SAE J2807 procedure in this pdf file:
https://www.automotive-fleet.com/fc_resources/pdf/j2807.pdf This is an "older, outdated test procedure. The latest procedure costs $145 to download and requires SAE membership. The one linked is free and "good enough to get a glimpse of what Ford, GM and RAM are using to certify your vehicle "max towing capacity". You can be assured that it "ain't under the conditions an RV owner faces on nearly every trip they take with their Keystone behing their "SAE J2807 tested tow vehicle"....