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I'm not sure where you are located but you may need to account for snow and wind loads along with a means of anchoring relative to the material its being placed upon (asphalt, dirt, etc.). I've seen and used the round top version (12x20) from ShelterLogic for temporary boat/boat trailer storage.
I bought one of these for a paint booth. Mine is inside my shop out of the weather and wind. I will say it is sturdy and great for my intended purpose. However, the covering is typical mid quality tarp material and the tubing is painted steel. If outdoors, you would really have to anchor it to keep it from blowing over and damaging your Corvette. So, it would probably be ok for say a few weeks or a month or two, but after that I believe the tarp material would deteriorate. Not to mention the rain collection pockets you will likely have to deal with in the roof. Similar to leaving a camping tent outdoors for a couple of months.
I don't know where you are located, but check with your local Planning and Building Departments to see if they require a building permit for one or if your zoning ordinance even allows them before you spend the money.
My Buddy had his 62 under one of those and it was great until 12" of snow caved it in. Also, bad image on HF- they show it housing a car over bare grass. The moisture from the grass is as bad as rain, if not worse.
I've had this one for 20 years. I store my 88 Chevy PU in it. It will be time to replace the covering soon. Usually the snow just slides off of it. It has had a foot of snow piled on it and it didn't fail. The tube structure is very HD. Wind hasn't been a problem either. It is anchored to an asphalt pad. It is a Cover-it, which was bought out by Shelter Logic. Not cheap, cost me $1000 20 years ago. I put black plastic down first, then 1/2" OSB. Keeps the moisture off the bottom of the truck. I also installed a ceiling fan that circulates the air 24/7.
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
I looked and you are on Long Island. I dont know what kind of wind and snow you get or the Harbor Side but I would say that Harbor FReight would be at best low to mid level quality. And since this is the winter I would look into shelter logic and double up on the anchors. If it is going to be on dirt or grass buy a another giant tarp and some plywood. Lay down the tarp and cover the plywood and park it on that. It will keep the ground saturation down and protect your frame. If you dont you will be very sad come spring.
Also buy a snow rake. Once the snow is frozen and it snows or rains again it could end up like GTR's friend's shelter.
I have a Shelter Logic and will go out twice during a heavy snow storm to clear the cover and never a problem.
I've had one for over 20 years - I'll get back with what to use to cover it - current stuff has been in place over ten years. No failures. No maintenance.
Temporary cover structure
