The next step up from a 20x30 canopy is our white 20x40 canopy tents. These tents have 3 center poles running vertically down the middle, along with 12 poles along the perimeter of the tent. All perimeter poles are held down by roping attached to stakes. When measuring for spacing we ask that you add an additional 10ft onto the tent footprint to allow room for stakes and ropes (ex: 20x40 tent needs a 30x50 footprint).