This is a long standing issue that comes up here often.
I am not a fan of the so called Weight Distribution systems, or as they are called sometimes Anti Sway systems, for most correctly matched vehicles.
I have more than 40 Thousand miles of hauling my 34 ft TT all over North America from the tip of the Baja Peninsula to Alaska (twice) and from the west coast to the Eastern shore of MD and all the way around the south coast.
At NO TIME did I ever feel the need for a weight dist. system. My truck is a Ram 2500TDsl
Now as contrast I just was hauling new RV,s for Horizon Transport for delivery to dealers and they require you to use the Weight Dist System.
My experience is this: After having driven both with and without the Weight Dist. system I find the ride and handling is actually better WITHOUT it. Now I have driven my trailer in winter conditions here in the lower 48 as well as Canada and March on the Alaska Highway...Definitely winter at that point on that road. I am not a summer vacation once a year driver of my trailer.
I contend that if you balance the trailer properly and DRIVE IT PROPERLY these add-ons are unnecessary. And in fact they may lead to a false sense of security that will ultimately cause you problems.
Now the RV haulers have a point about the dist system their reasoning is that since you are hauling an EMPTY trailer these help keep it on the ground and they may be right about that. But I certainly never needed it to distribute weight.
Now there are certain vehicle combinations which DO benefit from the WD sytems. But I believe they are rare. IE cars and SUV's hauling larger trailers.
My advice to newbies is this: Learn to load and balance your trailer properly and drive it properly...you drive it, it doesnt drive you. This one $300 add-on will not save you if you cannot understand how to properly drive a trailer in the first place.