Wooo ending the thread for ya, sorry about the late end!
[ Gaunt tries not to crash upon hearing that, then settles himself, and explains. ] Trikes are a form of Motorcycle-based transport that tends to mount a heavy stubber or autocannon as a form of support weapon. Some Imperial Guard or PDF units utilize them. [ Gaunt then launches into a long story about the ghosts using them on a desert planet that will most likely take the rest of the trip to finish, but basically consists of Gaunt sending out a big huge heavy weapons specialist that he knew was brilliant, but everyone else assumed was simple as a form of trap to find the quisling among a group of technicians who went along on the convoy. ]