It's not a question of will they break, it's a question of WHEN they will. The trailing arms on the Roadmaster R4R and R4RR chassis equipped with “Monaco Gold” suspension manufactured by the former Monaco Coach Corporation (MCC) are prone to failure, which can cause sudden handling problems and even a loss of vehicle control that could result in a crash. These Source Engineering trailing arms are several times stronger than the original parts and are backed by a Source Engineering lifetime warranty to the original purchaser.