I had the same concerns, but did FAX my completed forms to the Oakhurst office after their assurance all personal info would be deleted/shredded after the credit check was run.
Their later email assured me they had done so, and I'm in the queue for a tank change and fill up. They did lose my first email with forms attached which was a bit disturbing.
I believe a neighbor refused to provide ALL the info they wanted and she was able to set up her contract without SS# and other info.