As noted above, all you need is a Vixen style mounting bar with a 1/4-20 hole in it, which most have, and you can then mount any DSLR with lense in place of a telescope. What you might have problems with is getting the go-to aligned. Most alignment procedures generally rely upon a scope with one of the steps being to center the star that the alignment procedure goes to, in the center of the eyepiece. Even with live view, without some kind of finderscope, you'll have a tough time, unless you are shooting a wide field view and just want to get in the general vicinity with your framing of the subject(s). Live view is almost worthless for finding your targets, IMHO. And unless your camera has an LCD that articulates upward to let you see it, you'll have to be on your knees most of the time trying to find something. You can add a computer to the mix, sending the camera view to the computer screen. This also lets you use some of the software that aids in focusing. Or, connect your mount to an iPad or iPod Touch and Sky Safari. Haven't tried that but it might work well.
I use a Canon 5D MKII with a Canon 70-200 2.8L, 300 2.8DO and a 400 5.6L. I did get the Vixen Polarie tracker but it wasn't up to snuff. The VX mount is a bit more for a more substantial platform.
The reason I asked is I've never seen it used like I want to.
Yes I do want to get a proper scope down the road but didn't want to dive right in as such. A Edge HD 8 is on my list.
If the Polarie was not "up to snuff" you might look into the Kenko Sky Memo tracker or the Losmandy StarLapse system, which are much beefier that the Polarie or the iOptron SkyTracker, the new kid on the block. The Kenko and StarLapse should handle much more weight but finding and framing your target(s) are still somewhat of a challenge (at least for me ) YMMV.