Hey, Welcome to BB!
This outdoor run is only for playtime, right? They're not being kept outside all the time are they?
Also, Oxbow carries some GREAT nature play products for rabbits that are made completely out of timothy hay. My buns LOVE them and they are completely safe -- food and toy in one! They have a lot of really great hide-outs which would be great for the buns!
How many buns do you have and how old are they?? Bun pictures are a must when you come to BB!
Love to see your little furry family members!!