Historical clue formulations

• Partners often work in this — 2025-06-04
• Like some truck trailers — 2021-02-23
• Bicycle built for two — 2021-02-08
• Kind of bike or kayak — 2018-05-16
• One after another? — 2014-10-11
• Oxen might be put in it — 2011-10-22
• Oxen may pull plows in this — 2011-06-30
• Two-seater — 2006-04-16
• Bicycle for two — 2004-06-28
• Two-trailer rig — 2004-04-12
• Many a trailer — 2004-02-20
• Two-seater — 2003-09-18
• Many a tractor-trailer — 2001-12-23
• Bicycle type — 2000-10-15
• Two for the road — 1998-06-21
• Partnership — 1997-05-03