Extra load on an LX200 (how much?)

How much extra weight can I attach to an LX200 and still be in with a chance
at taking photographs?  As a pre-emptive follow up question, is the 10"
better suited to photography (and can it take more weighty attachments) than
its larger brethren because it's on the same forks as a 12", or is that
missing something?

I'm envisaging a 4" guide scope (or smaller), plus cameras on the guidescope
& the SCT.

Regards,
Michael Kreuzer