On Aug 18, 9:26*pm, "James" no wrote:
several * 2 *x * 4's * , *turned *up, *should do the trick. *Trucks come off
the concrete, roll over the *2 x 4 * pieces, and THEN *drop off, and not
break anything

Suggest you also be mindful of the weather and soil. If the soil that
you're putting the 2x4s on is moist, they may just be pushed into the
ground by the weight of the trucks and become useless after the first
truck arrives.