A relative bought one here:
http://ezcarports.com/catalog/index.php
He was very pleased with the quality and set it up in a few hours.
he had 3 walls aswell on the unit.
The unit worked great during that big snow we had a couple years ago.
DONT BUY THE CHEAP CLOTH COVERED CARPORTS!
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"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen
US NAVY RETIRED