Ken,
I own three trailers, two with springs, and a newer one with "torsion" suspension. These trailers have all been driven cross-country many times over the years. The "torsion" suspension "EZ Loader" I acquired early this year has been the best trailer I've ever owned! It goes down the road without bouncing, accepts the bumps easier, and is several inches lower than the models using "springs". It has "salt water" disc brakes, a "bolt-together" 100% hot dipped galvanized frame, and oil filled hubs with "sight glass" spindle caps making it easy to check lubrication. EZ Loader has a distribution center at Elkhart, Indiana and dealers across the East Coast. Have a look at one, I think you will be impressed with the product.