Expert Answers about Forest River Sierra Fifth Wheel

• Pin Box Upgrade Options for Lippert 1621 Pin Box
• The information you provided is perfect! The weight rating and the "1621" number you found is exactly what I'd need to know to confirm replacement pin box options. The Lippert options we have include the Rota-Flex # LC328330 and the Trailair Flex # LC328492. The Rota-Flex is basically a step up from the basic 1621/1621HD pin box # LC1191191 in that the head can pivot some to help with ride quality. The Trailair uses a rubber compound in the head assembly as well as an air bag and shock...
  view full answer...