The newest pick-up tire cage is now available through Martins Industries. The pick-up truck tire cage was designed, tested and manufactured to transport tires of all sizes, according to Martins Industries. The tire cage works on all types of pick-ups that have an 8-foot box. On average, it can transport approximately 100 tires of 17 inches in diameter. The cage is equipped with a safety net for the top, a locking system and stainless steel hardware to prevent rust.