hmm, holden stub axles.. got one at the farm but two...nah last time i seen them was when the dozer pushed them into a hole and covered them up...now i'm not digging them up...
they would be strong enough for more than that sort of weight and you can use a ballrace to mount them but wont be the way i will go now...the stand is easy but the base is something else...synta/skywatcher EQ6 is what i was offered by a dealer and am wondering if it will handle the job on a decent rhs stand...There will be a fair bit of weight with the electronics mounted on it...
i will go and check the mounts you have named too...