I te tau 1915, i whakahaerehia e Davidson me ētahi kaiako honore e 30 tētahi rōpū motokā o ngā Cadillac whakarerekētia e waru i roto i tētahi Hīkoi Hīkoi mai i Chicago ki te Whakaaturanga i San Francisco
ka hoki mai i waenganui i te nui o te whakamanamana e nga kairipoata i te ara. I tīmata te waka i te taha o te kura o Highland Park i reira a Davidson i roto i te Waka Aroturuki. I tiimata i te Pipiri 10, 1915, a i whakaaro ratou ki te haere ma Moline, Iowa City, Omaha, Denver, me Salt Lake City ki San Francisco mo te Whakaaturanga o Panama-Pacific i te Hurae 14, 1915.