I've always used my proper jacking points - but that said, mine aint a rotbox

Rear beam, mid-chassis legs, front chassis legs, front subframe > body section are my supports of choice.
I put them wherever they're not in the way. Chassis legs are structural points - so anywhere on it is fine.
For the front, normally I go for the very front chassis leg where it meets the front x-member - jacking from the rear subframe/front x-member.

For the front, then I jack from the jacking points and support under the chassis leg at the middle/front.

For the rear, if I'm not working on the rear beam, then I support from the rear beam and jack from it.

For the rear, if I'm working on the rear beam, I jack from it and support on the rear mount points (not a great photo, don't have any others).
