Don't play double-bass, but my '96 Honda Odyssey is great. I can fit two basses, a pretty large combo amp, effects box, two guitar stands, cables, and four people! Plus, the middle row comes out, so it can haul a set of shower doors. And then there was the time that we hauled six people about 70 miles in one day with various luggage and shopping bags in back... That car can load up, but don't expect to go anywhere. On the interstate, there's a huge hill that at the bottom I can easily do 70, but once I get up the top I'll be lucky if I'm doing 60. And that's only with me and my dad riding shotgun. 130 HP + 6 passenger, 3600 lb. van = severely underpowered.
I have a good friend/teacher who I help run audio at various gigs. Last summer, we fit a really big mixer rack, two 5' speaker stands, six mic stands, the stage snake, a suitcase of cables, a milk crate and another bin full of more cables, a case of mics, a box of adapters, a couple dinners and ourselves into his CR-V. The only thing we couldn't fit was the speaker cabs, which came with the guy who was running the show.