Manufacturers will usually gladly tell you if you can run transformers on their dimmers, since not all of them can. This means if theirs does you'll probably buy their product instead of someone elses. We had one manufacturer certify that their dimmer would dim a certain brand and model when we asked them and provided a sample... all for free... Well, we did buy over $6M in dimmers from them for the project...
You can usually get a written "yes" or "no" out of them though.
