Historical clue formulations

• Vacation vehicle — 2016-10-13
• Travel as a group, in a way — 2015-03-22
• Desert procession — 2012-03-26
• Line in the sand? — 2011-08-26
• Dodge on the road — 2007-09-26
• Parade — 2006-05-20
• Desert parade — 2005-08-07
• Desert crosser — 1999-11-18
• Spice route procession — 1997-04-25
• Group of pilgrims — 1995-07-01
• Truck : lorry :: trailer: _____ — 1994-03-23