Polish Stainless Steel Side Entry Step Box Extensions Select Silverado SierraLUVERNE side entry step box extensions are the perfect complement for our stainless steel side entry steps. Like the side steps, these truck bed steps feature a strong, non corrosive construction and a safe, functional design for work trucks and classic custom builds alike. They also offer a custom fit for each application with no drilling necessary. LUVERNE box extensions are unique from side entry steps. While the side steps mount onto the cab