The next best thing for for curbing trailers is air ride if it's a Bumper pull or Goose neck. By putting your trailer on an air ride hitch with a bumper pull you will reduce the bounce that you feel when pulling a bumper pull trailer to where all you fell is the weight of the trailer and not the bounce, and with your goose neck trailer it gets rid of the surge ( push and pull ) of that trailer to there you only fell the weight as well. While making it a smother ride for you, it reduces the abuse / fatigue that your truck and trailer experience from the bouncing and the pushing and pulling of your heavy curbing trailers.