Posting to give back as I received a lot of advice on here....
I was approved for a DTV at Vancouver Consulate. I provided a credit card statement for proof that I was in Canada because my driver's license was expired. Also provided previous month bank statement showing closing balance over $20K CAD, though the balance was lower than $20k at certain times of the month. I own a Corp in Canada, but I'm the only shareholder, so I provided the Business registration docs all in 1 PDF. 7 days later, they ask for further documents regarding the nature of business of the Corp and how the applicant would work in Thailand. I answered those questions in an official company response and submitted it... was approved 6 hours later.
Feel free to call the consulate to ask questions before applying. They are very helpful and often pick up on the first ring.