I purchased a Costco Car Shelter this year. 10' wide x 20' long and approx 10' high. I raised the height 1 foot. My van might have fit before raising it but I never tried it because I had already made the extensions.
I back into the carport on a bit of an angle so the extra height makes it easier.
The extensions are 2" emt (electrical) pipe epoxied into the original carport bases which I had to ream out a bit wider. The emt pipe is filled with concrete to within 6" of the top edge.
The eight pvc feet are secured with four 3" lag screws in each to a double layer of treated 2 x 6. The 2 x 6 forms a continous frame. To anchor it, I purchased 8 pieces of 3' long threaded rod that I drove into the ground through the wood frame and tightened the nuts. I think that is sufficient for my location. No tornados around here.
With the extensions the shelter is 11' from the ground to the peak.
CDN$209 for the shelter at the local Costco.
When we dug out the sod in preparation for road base and gravel we found two 4" sewer cleanouts about 10" down. I would never have known they were there. These covers make it easy to access them.