As long as you have the key lock in the handle, this kit is all you need. The gate will then lock and unlock with your door locks, a feature that is really nice and convienient.
I have installed 2 of these kits. When you wire this in, I personally would select one of the rear doors as the trigger. That way it will only unlock on the second press of the FOB, together with your pass side and rear doors. (unless you set the truck to open all doors at once)