Weight distributing hitches are needed if the trailer is heavy enough that a weight carrying hitch is not sufficient, or the back of your truck sits low to bring the trailer and truck level.
Sway control comes in two kinds and I wouldn't think it's necessary unless the trailer is 25' or longer.
I would pull the trailer if you have the biggest tranny cooler money can buy and decent gears. You'll need the correct wiring (it probably has electric brakes).
My family started in tents, then got a pop-up camper, (mistake) then a 16' travel trailer, then a 25' without a slideout, (that was our first new one) then a 25' with one small slideout, and the new one we just got on Friday is a Fifth wheel 30' long with one super slide (although we looked at some with 2 slideouts as well).
For the 25' we have 600 lb. weight distributing bars and friction type sway control, but for a 18', a weight carrying hitch should be fine, and with electric brakes, I see no point for sway control.
I'm somewhat worried though--I've never towed anything as heavy as my new 5th wheel is.