No. Only 4' width. See the pro desk about special ordering something that may be wider than 4', as each store has access to different things.
Yes, has the traction grooves.
With a visit to your local store's pro desk, you may find these available by special order.
You would thin Home Depot would include this very important information in the Specifications section of the description. I had to go to the store with a tape measure. It's not 12". It is less than 11". Not sure what that person who answered in 2016 was smoking.
Thank you for your recent inquiry with The Home Depot. This item is not sold online but in your local Home Depot store. To determine availability you will need to localize the item online by using a zip code. Unfortunately, if you are unable to see the store inventory, then it’s most likely not a stocked item in your area. You may also want to call or stop by your local Home Depot store and talk to one of our professionals. For any other questions, please call us at HomeDepot.com Customer Service 800-430-3376.