Cattle or buffalo drawn carts moved large loads such as rice straw that remained after harvest or logs harvested in the nearby rain forest. Small loads were moved using a bicycle or a human-carried load pole. Oxen pulled the plow that turned the soil for the next cycle of rice growing. I suspect people and war material were hidden in some loads. American artillery men did not check Vietnamese vehicles for contraband and I am sure some was carried on occasion. We were not trained or expected to inspect them.