BTDT still have the empty frame in the back yard. I was tempted to screw steel panels on the frame, just never got around to it. As others mentioned, if in snow country, don't waste your money or time, they don't last.
With the price of steel today, carports are too expensive as well, but they make a great alternative. Versatube is one of the brands that makes car ports and I have one of those I put up at least 15 years ago and other than needing a good washing and regrading inside, has held up very well in all kinds of weather.
Whats funny though, I actually last Saturday, put up a 12 x 20 Amazon Special IN my garage! The ceiling is 9' in the garage and all open walls and trusses, so any attempt at heating would go right up and out, so I got this shelter for ~$500, had to cut 10" off the side tubes because it was not 109" as stated but 118" tall. I fold back part of the roof and remove the first arch and horizontal so the garage door can be opened, drive in waht I want to work on, then when the garage door is down and disabled, I reassemble the first arch and roll the roof back in place, put the back wall on, and turn on my heater. So now I have a warm place to work on my trucks and tractors and other equipment, and in the summer will have a place to do body and paint work.
Since I live in snow country, this shed would NEVER last a season, it is way too flimsy, the feet for the wall tubes bent as I assembled it, but as far as the cover material, it is pretty heavy duty, and if tied down properly would hold up to strong winds, but the frame wont hold a snow load. It is big enough to put my 1209 MoCo and NH273 Haybaler.