Welcome. There's a LOT of information here, and it's pretty easy to find.
Stay after the salt in just about any manner and you'll be fine.
I bought a pump up garden sprayer at a yard sale for a buck. It had a brass tube from the handle with no tip.
Brazed it shut and drilled it out.
Sprayed used motor oil and white kerosene 1:1 under my daily 03 S/D in the spring and fall.
Truck is still rust free.
All Ford all the time.
83 F-100 300-6/C6
84 F-150 300-6/AOD
69 Merc Montego convertible 393 4V Cleveland
86 LTD Crown Vic 2 door sedan 347 AOD
03 F-250 SD 5.4 2V