2012 F-150 w/EcoBoost. Towing a camper (3300 lbs dry) and minimal load in the truck's bed.

Which upgrade would make the most sense?

We will be making a trek from South Dakota to Fairbanks in April, so I'd like the best ride possible for the investment.

https://www.suspensionconnection.com/59568-f150-air-springs.html

https://www.eaz-lift.com/product-page/eaz-lift-1000lb-elite-hitch-kit

(Not the exact products I am necessarily wanting to get, but simply examples of each)