I forgot folding shovels, too. I have 2 in the Tahoe and one in the Jeep. When traveling with the travel trailer, we also carry several lengths of 1x6, 2x6, and 1/2" plywood. They are handy for leveling the trailer and bridging deep ruts in the road.
BTW, having 2 shovels keeps the nasty "how could you be so stupid to get us in the stuck way out here" comments to a minimum as the other party will be too busy, and winded, to speak.
Pat