I know it's not an EQ series mount, but I've replaced the standard Celestron head with an
ADM Saddle Adapter on my CG5 so I can have D-series dovetails on all my OTAs and they can go on both mounts.
Ken, I wouldn't think of lifting the CG5 (not as heavy as an HEQ5) with my 127ED on top of it. You'd have to leave the counterweights on to stabilise it and that's another 15Kg.