I am sure there are all kinds of successful PRTD applicants. Why do you not have your PR card? If you don't have it because they haven't finished processing your renewal or you have recently landed you SHOULD be ok provided you have enough time to wait for your PRTD to be processed wherever you are going.
If you are waiting on a renewal of your PR card but that renewal is being held up because of questions pertaining to your RO then I would not take the risk in leaving the country as they might not issue you a PRTD until that is resolved, but in the process you will have to remain wherever you are.