I'm getting ready to purchase a side net and I've noticed some Continental Challenge cars use dual side nets. I can't find a regulation that requires this, but it does seem logical to protect the driver's head from both sides. Is anyone using this type of setup?

Here are some pictures of the setup:
http://www.turnermotorsport.com/html...ound1-daytona/
(scroll to page 6 and look at the photos on row 4.)