SkiFreak
Crazy Person
Be aware that a three point mount system can give you high point loads on the chassis. The Canter, with its stepped frame, is not ideally suited to this sort of mounting system. It is probably better to try and spread the load over as much of the chassis as you can.I am planning on a 3 point pivot (front pivot).
If you do go with a three point mount, having the single pivot point at the front is probably better that the other way round. I would look at how a dump body is mounted as an example of how it should be done.
Should you want a pass-thru between the cab and the camper, a single front pivot would make this difficult.