Boydstun does its own roof modification. We understand if you prefer to have it done elsewhere, but in order to minimize possible schedule delays, we can get it done in-house in order to keep your truck moving through the building process. Boydstun now offers a sleeper only option. This lowers the stock sleeper cap down level with the cab. This picks up a few inches of vehicle height, but gives you the additional room in the cab and sleeper that a full chop doesn't. It also keeps the stock Peterbilt look in your truck.