You should not need a Load levelling/WD(Weight Distribution) hitch for a 16' unless for some strange reason you have a trailer that is much heavier on the tongue than most 16' Scamps or you are pulling it with a vehicle that is not rated to take the tongue weight
An anti Sway bar is a good thing to have but it should never be something that you actually "must have" in order to keep the trailer from swaying under normal towing conditions. An anti sway bar should only be used/needed as a emergency type device for those one off crazy avoidance moves - which hopefully you will have very few of if any. If you actually need an anti sway bar to keep your trailer from swaying during normal towing, you need to address whats causing that problem before installing the anti sway bar.
When setting up a new trailer or a new tug to an old trailer I always do a few test tows before connecting the anti sway bar to make sure I have done all I can as far as levelling the trailer to the tug and balancing the storage of items in the trailer to get the trailer to tow as stable as it can be & know for sure the anti sway bar is not what is keeping it straight.