I have a variety of scopes in the 12lb to 15lb range, such as a 120mm APO, and 8" SCT and a 6" Ritchey-Chretien
And I use them, one at a time, on my CG5. Not the most expensive mount but it's reasonably sturdy and can do short-exposure astrophotos. It's already pretty bulky to take around and set up.
But times come which I wish I could mount 2 of my scopes, for example to have one with a camera and one for eyepiece work, or for short-duration events like the recent occultation of Mars where I want both of us to be able to observe at the same time with a good scope.
But it seems that the mount market is all lower-priced mounts that can't handle this amount of weight without a lot of wobble, even for observing, or >$1,000 mounts which are heavy duty and good for astrophotography.
If I were a more serious astrophotographer I would buy something better than the CG-5, though it would probably not be easy to transport. (I live in Bortle 8!)
My ideal would be a heavy duty Alt-Az mount with computerized tracking capable of about 20lbs -- small, not too hard to set up, good for observing but not photography.
I guess a CG-4 might barely handle the weight, and you can get that very cheap, especially the Orion version ($140 at High Point?) but probably pushing it and no clock drive so things drift out of view fast enough.
Now I don't really use the Astronomics Ritchey-Chretien and probably will sell it, since a 6" R-C is not really ever going to outdo a much more expensive 120mm APO refractor or an 8" SCT, even as an astrograph. At least not this one. Though it is the smaller scope and so could be the more portable observing one to grab and go with.
Or do I need to plunk down at least $700 or so to get something here (more than I paid for the CG-5 long ago.) I guess if I found somebody selling the fork for the Meade LX-200 that would do the job, but I got it used as on OTA for just $300 because why not?