Slingerlands Truck Caps is located in Westtown, NY. We are the premier truck cap and tonneau cover dealer for southern New York and northern New Jersey. We carry a full line of truck accessories. Our friendly sales associates are happy to assist you in finding the proper truck cap or bedliner for your truck.. Onsite Services,Repairs and Sales of Auto Ventshade Ventvisors,Caps,Drop-In Bedliners,Running Boards,Tonneau Covers,Trailer Hitches,Truck Accessories,Truck Caps,Snow Plows.