The old adage of "don't tax you, don't tax me, tax the guy behind the tree" might apply in this case, from the May 24, 1907 NYT:

M. Dupuy arrived in Paris two or three weeks ago, well in advance of the party to whom he is to act as guide, mentor, and friend, and ten days ago he started in a motor car over the route which he had selected for the American automobile caravan to follow, so as to obtain all desirable information and make the best arrangements for the convenience of the transatlantic tourists.

M. Dupuy is now travelling over a part of the route by train. He left Paris in an automobile and arrived without a mishap at Perpignan, near the frontier of Spain and France. The Spanish customs officials called upon him to pay a deposit of 1,500 pesetas ($225 [$4,823.55 in CPI adjusted 2005 dollars]) before they would allow his foreign automobile to cross the border, this being a regular formality with which all automobilists have to comply. The money is, or course, refundable when the travelers take their cars out of Spain...

Undoubtedly those Americans who are going to join M. Dupuy's caravan will be in a position to profit by their cicerone's experience.