The success of using “radio” form a railroad boxcar to attract crowds inspired Clarence Jones and D.5. Clark to build the "Gospel Sound Truck."

A 1936 truck was outfitted with a portable transmitter, generator and loudspeakers to "broadcast" the gospel to all within range.

Concerned for safety, Clarence Jones managed to get a permit signed by the president of Ecuador, giving them permission to broadcast freely for any public place throughout the country.

Form the beginning, Ecuadorian pastor played an Integral role in the sound truck ministry. C&MA missionaries D.S. Clark and Reuben Larson mentored many of these leaders on evangelism.

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