Ok, I figured it out. But, in order to convey it to you I scanned in 220 pages and added them to the website.
To answer your question go here: Documentation/Literature/1984 Literature/1984 Light Truck Data Book and then:
Page 32 gives the option code for the Trailer Towing/Camper Package
Page 34 gives the details on the Trailer Towing/Camper Package as well as Handling Package
But, to make it easy for you, here's Page 34:
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI