How would you turn these two bottom bunks into beds for young toddlers? Our twins are 9 months old and will probably stay in the pack n plays until they start sleeping through the night so they don’t wake the big kids up. We tend to keep our kids in cribs until 2-3 years old. If we just put a bed rail I’m not sure the babies would stay in safely. We don’t own this trailer yet but are hoping to go look at it this weekend.