Towing experts?

Well the general consensus here is get and use the WD hitch which is most likely what I am going to do, most of the responses here are from people towing very heavy rigs, the only reason I posted this is because this rig is only 20ft and 3400lbs therefore maybe I didn't need them BUT because I'm single axle that could change things and of course I don't HAVE to do the posted speed limit but with the truck I'm using and light weight of the trailer it should be easily achieved and of course the higher the speed the more risk of sway. Believe me safety is FIRST. Thanks for all the info here as always.