Leading Trailer Dealers in the Eastern US EMM Sales & Service is one of the leading trailer dealers in the eastern United States. Located in Brownstown, PA, we offer the very best farming transportation equipment from companies you’ve come to know and respect. We specialize in Walinga and Wilson trailer sales, along with Travis and Muv-All. You’ll find just the right feed and livestock transportation trailers, parts and services for your agribusiness needs. At EMM we’re the trailer dealers you can trust to provide you and your farm with the right transportation equipment to get the job done.