Bismarck Canvas Inc P.O. Box 7054 , Bismarck , North Dakota 58507 USA About Solutions products Publications videos Companies Bismarck Canvas Inc Products EXT - Conversion Grain Trailer Switch on Trailer EXT - Conversion Grain Trailer Switch on Trailer From EXT Electric Tarp Conversion - Grain Trailers 0 Share Includes: 1 Front Arm and 1 Rear Arm Assembly, 1 EXT® Conversion Switch on Trailer Kit, 1 Motor 1.8 Hp, 1 Roll Tube Adaptor, and all mounting hardware. Most popular related searches grain trailer Videos related to this product Bismarck Canvas Roll Tarps Electric Tarp and Hopper Opener - Video Customer reviews No reviews were found for EXT - Conversion Grain Trailer Switch on Trailer. Be the first to review! Add your review Publish your review Great! review successfully added!