I would suggest that you consider an alternative by the manufacturer Reese as seen here:
Click Here
look for the link titled Reese Door Hardware 2021 Catalog
I would suggest that you consider part number 769C as seen on page 23 of that catalog. The polyurethane is an absolute superior option when it comes to inserts most especially here in south Florida where we are located.
sSame types of maximum lengths apply but be mindful when you order anything longer than 36 inch is when it starts to become elliptical on the graph of cost to ship versus cost of base material. Shipping 3 ft pieces is not going to trigger a shipping charge thats out of reason for most people but when you get to 4 ft 6 ft it does noticeably become more expensive and when you get to 8 ft it becomes extremely expensive.
Reach out to us for any additional information that you might like to have prior to placing an order