Got mine through carports.com and believe it is made by TNT. I bought the heavier 12 gauge metal, 21 ft X 18 ft that has survived the winters here in the Laurel Highlands of PA unscathed for several years - A smaller one covers my patio. I enclosed the RV shelter with metal siding (3 sides) purchased from a local supplier. Carports.com were easy to deal with, cost effective, delivered the unit within a few weeks and performed the set-up in a couple of hours. I had to prepare a level area ahead of time for the set-up and they used long rods driven into the ground and large lag screws on the RR tie base to secure the unit.
The patio unit (in winter) is partially seen to the right of the gazebo.