Now enjoy the advantages of steel and aluminum at fiberglass prices, Earl Stocks Trailers offers steel-frame, fiberglass skin trailers at a fraction of the weight and cost of most horse trailers today. Long appreciated in the RV and transportation industries, fiberglass is a strong, light-weight, and stain-resistant material that won’t rust, or corrode. If you want the same sleek finish and fuel saving you enjoy in your car or pick-up, ask for the ES Trailers.