I forgot Horn Dawgs on my list of ribbers that I contacted for the Toronto Ribfest. Here's their response:
Thank you very much for your e-mail. Our sauce does not contain peanut or tree nut nor do we use any nut oil in our cooking however, we do have a manufacturer that prepares our sauce for us thus we cannot guarantee that in the processing it has not come into contact with nut products.
We look forward to seeing you at the Toronto Ribfest!
Based on our general house rules for DJ's nut allergy, we wouldn't have tried these. At the same time, I really appreciate the company getting back to me. Some didn't.