Interestingly, the battery went down again while door was opened for 2 hours. Seems like any non-running lighting just sux the life out of the LR battery
First of all, the lights don't stay on indefinitely when the door remains open. I think they shut off after a fairly short elapsed time. Even the radio will not stay on past maybe 20 minutes.
Secondly, you can set all the interior lighting to stay off when doors are opened like when you are packing up for a trip, going in and out a lot while camping, etc. It's in the manual but just depress the front center lamp button for a few seconds until you see it "blink". This sets them to not come on when doors are opened, only on if you turn them on.
This feature is really very nice as it also keeps all the door bottom "puddle" lamps off.
To toggle back to normal battery draining auto-on, just depress again until it blinks.