Studebaker Avanti models include an unusual feature designated as torque boxes. Better known as "hog troughs", they were designed to bond the wider Avanti body to the narrower Lark frame to prevent damage to the fiberglass body. Studebaker
engineers wanted to increase strength and rigidity with the "hog troughs" to resist the forces of torque without increasing the weight of the Avanti any more than necessary. They are called "hog troughs" because that's what they resemble when separated from the frame. They are not "hollow." The top is open, the steel forming a three-sided box. These formed steel channels are riveted and bonded to the outer underside of the Avanti body extending from the rear of the front wheelwell to the front of the rear wheelwell.