Last week the day before I was to leave on a camping trip to Delaware, the truck's Low Engine Oil light came on. I checked and had to add about a quart and half to bring it up to level. I was very fortunate the light came on before I left for the trip - otherwise I may have damaged the motor towing the TT without proper level of oil in it.
The engine does use oil over time, and I had not checked the level since the last oil change. I learned my lesson and keep a couple quarts in the truck at all times in case I need them.
Like the OP said - check your oil levels!