Bill... Pulling the fuse isn't only about keeping the battery charged. The fuse stops other things from happening too! On mine, the warning bell indicating the the keys are in the ignition will continue to chime along with turning off all the dash board/radio/gps lights if the fuse is not pulled. I think the odometer is also turned off with the fuse... there's probably other things that I'm just not aware of.
So, just running a charge line (of which I "DO" have) won't eliminate all these other little items the fuse controls.
Happy trails to you too!
Ron