Congrats on the new pad, but I hate to be the bearer of bad news...
Those are stock Ford 20x8 wheels, right?
(Cue the broken record...)
You do NOT put 12.5 tires on a stock (8 inch wide) wheel. They are NOT the proper size, period. It doesn't matter how many people do it, that doesn't mean they're the right fit...sorry.
Just about every tire manufacturer has a "recommended rim/wheel width" specification on their website, and I couldn't fit a single one that recommended a 12.5 inch tire for an 8 inch rim.
Here's Toyo's spec sheet on those tires:
OPEN COUNTRY M/T| Mud-Terrain Tire for Pickups and SUVs | Toyo Tires
The MINIMUM recommended width is 8.5 inches, 10 inch ideal, 11 inch maximum.
Why does it matter? You may get it to "fit" (as obviously a whole lot of people have) and it may look right, but you don't need to be a tire engineer to figure out you're putting a whole lot of sidewall stress on the tire by fitting it on a wheel that's too narrow. And if you tow you could be asking for all sorts of trouble.
Personally, that's definitely trouble I don't want or need, and although it seems a whole lot of tire shops don't seem to mind that they're fitting the wrong size tire on a rim they sure would care if there was a catastrophic malfunction/failure followed by a wreck...or worse...
That's when the "I read it was OK to do it on the internet" excuse would fall real short in a court, etc.
I've seen this happen time and time again and it kills me that someone drops that kind of coin (close to $1500) and someone at Tire Rack, Discount Tire, etc., didn't take the time to make sure they were the proper fit for the application to begin with.