Looking to buy a used F-150 for towing a travel trailer (yet to be bought... 22'-24') and I found this one...
2018 F-150 Lariat 4x4 Supercrew
157" Wheelbase (prefer 145 but whatever)
3.5L EcoBoost
502A Package
3.55 Electronic Lock RR Axle
7050# GVWR (?)
Trailer Tow Package
FX4 Off Road Package
36 Gallon Tank
Integrated Trailer Brake Controller
Lariat Sport Package
Leather Buckets w/ Console

So it seems to have everything I want but I'm concerned about it not having the Max Tow Package. The truck does have the 3.55 axle, trailer brake controller, and 36 gallon tank added -- what else is it missing? Is it missing any crucial cooling necessary for towing?

 

You need to get a pic of the truck's payload sticker. that's the most important number for towing a trailer. It may have a low payload capacity since it's a bling Lariat trim.

 

Would seem unusual to add that tank after the fact. Here is the chart of the various tow packages:

 

sounds like max tow package.

Course, i'm adding 36g tank and added the ITBC (both are easy to do).

 

I'm no expert as I learn something new everyday. but I like playing the guessing game! Based on those specs, I guess 1600 payload! As we all know payload dictates what is the 'safe' size of a TT is but my guess a 22' or 24' shouldn't be a problem unless it has slide outs, safe travels!

 

Probably pretty close! OP, that truck sounds similar to mine, except mine is the 145" WB. My payload sticker says 1,647. I tow a 31 foot (hitch to bumper) TT that weighs about 7,000 loaded. Tongue weight is about 950 lbs loaded. It tows great - much more solid and smooth than I expected with just a basic Fastway E2 WDH.

 

You can use the VIN to get a window sticker for any vehicle that is for sale at a dealership or used car lot. The window sticker will give you the gritty details about what tow package you have, and what your GVWR is. Yellow sticker is the only place you'll get the payload.

Post details about the trailer... UVW, GVWR and dimensions, then we can help you confirm what you'll need for a great towing experience.