[Newbie Question] What size shank?

[Kubo2021]

Newbie here, with a newbie question.

Was going to order Equal-i-zer hitch but I don't know what size shank I need to get for my setup:

TV is 2021 F-250 (short bed)
TT is Rockwood Ultralite 2608BS

As a default, Equal-i-zer says it comes with the following specs for its 1,400/14k hitch model:

Tongue weight: 1,400 lbs
Maximum gross towing weight: 14,000 lbs
Ball size: 2-5/16" (Not included)
Shank length: 12"
Sway control bracket positioning: 27" - 32" back from center of coupler
Maximum trailer frame height: 6"
Maximum rise: 7" from top of hitch receiver opening
Maximum drop: 3" from top of hitch receiver opening
Spring-bar dimensions: 36" long x 1-1/2" wide

But how do I know if that will work with my F250? I already know I will need to get a 2.5" to 2" adapter, but is 12" shank length correct? How am I supposed to know about the rise and drop measurements?



Any advice would be appreciated.

[Stank Bait]

Maybe this will help
https://www.etrailer.com/faq-ballmount.aspx

[psdx]

Equal-i-zer sells a 2-1/2” shank. Using an adapter causes a sloppy fit, which in turn can wallow out the holes for the hitch pin. If you’re buying, do yourself a favor and buy the shank that fits your hitch without an adapter l