As for me, I use a 240/12V AC/DC 8 Amp ($25) at home and a small 1200W inverter gas generator when going to my favourite site. This generator provides a very good quality current and is really a bargain ( $220 ) compared to a simple battery. I use it for our club to power up 3 mounts ( one Losmandy and 2 EQ6/EQ6-R ) plus 3 laptops and all the accessories, wifi, cameras, focusers, several Raspberry Pi plus the red lights... And it only weighs 12Kgs. Roughly 8 hours autonomy with 1.5 gal. Really an option to consider.
EQ6-R is rated 20Kgs for viewing and 17Kgs for astro-photo by SW. I use it with a 16Kgs payload (more or less) for photography and it's all fine. On the other hand, be sure to have a good quality power source, that's an important condition for things to run smoothly
Hi, I have an EQ6-R with a Celestron C11 (30 lbs with dove tail and minimal accessories.) I need the extend bar and 2 * 5kgs counterweights at the very end of the bar which is not a good idea. To put it simple, well, get a third weight.
Just received my own a few days ago. Already learned two things reading here :) The home position markers and the possibility to dim the polarscope built-in LED. That last one was really a problem, the LED being stuck in the brightest position. I adapted the EQMOD server on a Raspberry Pi running under Fedora Linux. So, the Raspi is now linked to my local network through WIFI, and I can control everything from inside my home. I can drive the mount, take pictures, align, change filters etc, whatever the temperature outside is, without catching a cold in winter or sweating in summer :) I plan to start the first tests as soon as the weather permits it. BTW, English isn't my native language, I hope you'll forgive my mistakes ;)