Give me a few minutes, and I'll edit this with adventures. Just going to take a bit to do up.
Random traveling encounter http://www.traykon.com/encounter/encounter4.html
Funeral Procession, Dungeon 135 pg 18 (caravan is a hearse coach)
Final Resting, Place Dungeon 122 pg 19 ("caravan" would be going through the Underdark and back)
The Buzz on the Bridge, Dungeon 110 pg 15 (get the caravan across the bridge infested by a hive of giant bees)
Riding the Rail, Dungeon 143 pg 18 (the caravan is a moving train)
The Chasm Bridge, Dungeon 101 pg 59 (Underdark bridge with pay or slay toll booth)
The Coming Storm, Dungeon 136 pg 36 (caravans are attacked by bandits during thunderstorms)
Capture the Queen http://www.wizards.com/default.asp?x=dnd/oa/20001101a
Road to Oblivion http://www.wizards.com/default.asp?x=dnd/oa/20030614a
Caravan Guards, Dungeon 26 pg 30
Courier Service, Dungeon 27 pg 24
Yes these are AD&D, but they shouldn't too hard to convert. For instance, the bhuts in Caravan Guards are also in the Fiend Folio.
That should give you a few ideas.