+ 1 on a recommendation for Fluke, and also Dennis's comments about
the clamp meter being useful for starting and alternator charging
issues (but maybe not all that much else).  I have a well-worn Fluke
79 that lives in my van, and a Fluke clamp ammeter adapter that lives
at home.

I've been amazed to see basic compact digital meters for as low as $6.
Great bang for the buck to add to your travel toolkit if you don't
have one.

Whatever you end up with, make sure to track down some spare fuses
ahead of time, for when you try to measure voltage with the leads
still plugged into the current measurement positions...

Alex