For a Huntington Beach CA carport style addition, concrete piers for the vertical structural members may be the preferred solution, with correct seismic specs IMO. Good advice that the local metal building supplier may have the best foundation team.
Welcome to the forum Don, sorry, no experience with that mfg. or similar.
PS -- The new search function in the blue bordered box above works great, so you might want to search for carport, garage or storage shed etc.. The Google-powered search engine looks only within this site, and you can tailor the search terms in the new frame that opens up.
PS2 -- A recent thread by Utah Man shows a good example of a metal building but probably larger than you want: