Congrats on your "new"
Casita Liberty! Ours is a '99, and we tow with a '98 F150... so we are an older version of your rig.
Bob Ruggles is exactly right
about the brake controller... and while the F150 has enough power and
weight to pull and stop your
Casita, it'll do much better once the trailer
brakes are ON. (Ask me how I know! It involved a maladjustment and a long, steep hill.)
Again, congrats on your purchase. I hope you will enjoy it as much as (or more than!) we do ours!