FastCover 30 wide single truss structure portable buildings are an excellent value for all your portable storage requirements. Whether you are using the FastCover 30 for agricultural, industrial or recreational storage, you will be completely satisfied with size, durability and light transfer in these FastCovers. It’s “tried & true” hoop style design allows for a substantial 12′ h x 12′ w fabric roll up door c/w ball bungees to keep it securely closed. Need a door on both ends, just ask. Powdercoat painted commercial grade 3″ steel for both the structure and the portable baserail, along with UV inhibited, high density polyethylene woven 12 oz. fabric and hi-tension kits, ensure years of maintenance free service from your portable buildings.