Extra radio - check. I actually bring 3. A dual band HT, a dual band mobile, and a 2M Mobile (Usually my APRS rig)

Batteries. Just a few. 2 90Ah GelCells (the size of car batteries) and 6 7Ah cells, plus 2 Nimh packs for the HT, plus an AA pack, with 4 sets of spare AAs

Food - I ALWAYS have 24-36 hours of eats in my urban kit (The HT above is in there too)

As I said, I carry a 24 hour bag with me all the time. I'm looking for the "extras" beside the radio gear. That I have plenty of (2 mast systems, coax, tool kits, spare antennas - all power on powerpoles, a scanner to go with the 3 rigs)

The earplug idea is a good one. I always have 1 or 2 pairs with me, but I'll add some more to the truck.

It's the dumb things that you forget that I'm looking for. The things you don't think of until AFTER a few times in the field. last time out I realized I didn't have road flares or a strobe to put on the truck (yes - it has magnetic retroreflectors on it)

I've taken the ARRL courses (all 3), and a stack of the FEMA stuff and a stack of Red Cross stuff
(I am the county EC and RACES officer)