I recently bought a new 2018 lariat diesel
502a that claims to have a tow package.
However I don't have the trailer brake switch
or do I see a trans cooler. I'm trying to verify
my actual tow capacity before I go out and
buy a trailer
Try looking up your truck on Edmunds.com: https://www.edmunds.com/ford/f-150/2018/features-specs/