Diy 2X4 Firewood Rack . A movable firewood cart for the outdoors. Rustic natural wood firewood rack that’s curved. New 2x4 Basics 90144 Firewood Rack System Fast Shipping eBay from www.ebay.com Rustic natural wood firewood rack that’s curved. For this build, you need to use 2″. A firewood hideaway at your backyard fire pit.