I use a "muck rake" the mining type they are great. Couldn't find a picture of one though. I use them all the time because at my location if there is any surface cover it is boulder clay.
I think we're getting away from convenient BOB/vehicle trunk carry e-tool, but other suggestions are indeed interesting too.
With some experience I posted what I thought was the bare minimum for a digging tool to carry in your vehicle. I've carried (and broken) most of the folding/telescoping shovels and e-tool type stuff. They're better than bare hands and a stick but not much. I'll take that mattock before any e-tool.
Evening,
The SOG Folding Shovel is on sale at Flys etc., in High River, AB for $19.95 (Stock# SOG-FO8N). Give 'em a call (403) 601-6120 or drop by the store.
I am not in the market for a folding shovel, but some of you like SOG gear so I thought I would post.
Cheers,
Mountainman.