Tent stakes unlike anything you'd use for backpacking... Been using these for awhile for awning stakes and to keep the shower tent from blowing away. At this point I haven't managed to bend one using the back side of my axe to pound them in. Almost any home supply store should have them in several lengths. Make sure you make them visible to others in crowded areas... they don't wiggle if you run into one :s
https://www.homedepot.com/p/Weyerhaeuser-3-4-in-x-18-in-Round-Steel-Stake-06178/202094305
Vern
https://www.homedepot.com/p/Weyerhaeuser-3-4-in-x-18-in-Round-Steel-Stake-06178/202094305
Vern