take a tractor (yes, i have one) and drag an old car into the road sideways take the wheels off and drop it on the pavement  it's not going anywhere use a few and make "v" shapes with them pointing away from your position  string barbed wire (yes, i have some - if you have a tractor, then you have barbed wire) with old cans with a few rocks in them. hear a noise? use the car headlights and batteries to light the area up  cars are notoriously bad bullet sponges, but if you're behind a few of them? yeah.. could work pay attention to choke points and remember that everything burns, so don't get sniffy and complacent  old us army field fortification manuals are interesting reading
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