What size aluminum tubing for beach cart?

Location
NJ
I'm looking to make a new beach cart out of aluminum square tubing. The local hardware store only has 1 inch square tubing with 1/20 inch thick walls. Is that sufficient enough to hold a superjet?
 
If you're trying to make it out of aluminum from a local hardware store it's going to cost you an arm and a leg. Probably more than it would be to buy a complete one. You need to locate a supplier and go from there
 
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