While I truly think the E2 would meet your needs, an Equal-I-zer for $100 upcharge is worth it. The E2's real weak point is the outside frame plate. The bracket positioning blots are surface welded onto that bracket. A little too much torque on the nut and the bolt stretches. It becomes weak over time and eventually snaps off. You need to order a replacement from Fastway. They are covered under lifetime warranty, but if you are on the road you are out of luck. In contrast, the Equal-I-zer uses actual bolts through the plate. If you ever broke one of those, any hardware store can help you out.
See part # 6 in the Fastway parts list vs. Parts 7 & 8 in the Equal-I-zer parts manual below.
Progress Fastway E2
The anti-sway on your F150 is an emergency system that won't do anything until you are nearly out of control. You need full time sway control along with a good W/D system.