I had the same problem in 2005 when we went to SFO, I had booked Full-Size, asked first for an Impala, when there were none, asked for a car with a big trunk, and was offered a Hummer H2 for $10/day, which I took (included Sirius and Neverlost). Seems they were looking for someone to drive it to SEA...
Bye, Frido.