Because the springs of the Recreation Trak are softer and there is less tension on the springs, we recommend replacing the poly bed every 7-8 years. This time frame can vary depending on the amount of daily use your Recreation Trak receives. If your original unit is older than 10 years, please fill out a bed worksheet.The Recreation Trak poly bed is 53in wide when measuring from outside edges of the d-rings and includes flaps to cover the d-rings. Be sure to order the spring tool, unless you have the original spring puller from your original purchase.