although my small vac is 110 and I run it from the Inverter, I can't seem to keep the 12V ones charged enough over time that they last (I've tried a couple different ones), I've now lost three.

The butane soldering iron is a must, as is the Dremel ... in addition to the bits mentioned here, I also carry several buffing wheels ... coarse, medium & fine.

I bring along a PortaCable quarter sheet finishing sander, I do use it from time to time, but it's not critical.

I don't bring the Multimaster or the jig saw, I leave these at home, I don't think I've ever missed them, generally the boat is ripped apart when I'm using these.

cheers, John