Good evening, 'S.W.', I'm sorry to learn of Delores' incontinence.
I offer the following as a theory - nothing more - as I have no direct experience of the problem. A car that drips the odd drop of oil yes, but nothing like the problem that you are experiencing.
I think we can assume that it is gear box - not engine - oil. When you return from a run of any distance, the oil will be warm, therefore thinner, and more prone to leak.
When you select reverse gear, the counter rotation of the tail shaft is somehow picking up the oil and 'pumping' it out past the seal in a manner not dissimilar to an Archimedes' Screw. If the seal is slightly worn or scored, it may exacerbate this process.
Under normal forward driving conditions, the rotation of the tail shaft contrives to keep the oil where it rightly should be - i.e. contained within the gearbox.
As I say, just a theory. I may well be barking up completely the wrong tree!
Regards, John.
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