I don't know exactly the size of the area and my car is 30 miles from my home so I won't be able to measure till the weekend. I've started looking at aluminum square tubing. It's available in 6x6 and 8x8. I know the 6x6 will fit. 6x6x24 would give me a little over 3 gallons which would be plenty. 8x8 would fill the area better and probably look better than the 6x6.