Trail King Pneumatic Dry Bulk trailers include all the features you’re looking for… as Standard Equipment, NOT expensive add-ons. Lightweight features like aluminum end frames, front and rear, for maximum weight savings. Full-depth crossmembers, for uncompromised frame strength. “Oversized” shell sheets and assemble by means of automated manufacturing techniques, for unsurpassed vessel strength and durability. And premium components throughout, to deliver years of dependable performance.