Bill, I don't think the radio is anywhere near 1/2 amp draw when turned off, but I could be wrong - I didn't measure it.
The reason I think this is that it looks very similar to a car radio to me, and I've been able to leave cars for weeks and still have them start up - and that is without a deep cycle battery in the car.
But there are plenty of other loads, and I wouldn't doubt that all of them together add up to 1/2 amp or so, and agree that a charger or disconnected battery is a great idea. The one thing I would add: Always connect up the battery before towing the TM anywhere, it powers the emergency braking system.
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