Am on a 9 day road trip and I forgot the most important trip accessory.
When going with two guys on a trip, one should be prepared.
I wasn't and so am sitting wide awake late @night, having to hear 2 blowing horns in the room.
The most important trip accessory is ear plugs.
Or you too would end having to sit awake and hear snores.
I have to say its sometimes interesting, suddenly one whistle blows from one side and a train moving noise comes from the other :-)