Well to be fair, there are a couple of other frequent visitors that can cause this issue as well. But you're right, a look at the rear drums should give an indication. I'd try the simplest approach first though on the off chance it is adjustment. If the vehicle is only irregularly used it could even be due to corrosion causing the imbalance. I used to have this on one vehicle I had where I used to have to click the handbrake on a few notches on the last block before arriving at the test station to get a bit of heat in. For some reason the left side was never even when it was cold and it didn't matter what was done to it. Had a rebuilt cylinder, machined drum, new matched shoes on each side, bled and physically cleared the lines - nothing 'fixed' it apart from testing with heat on it.
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