+1. My problem is that I often change my setup for different gigs, so I can't just make one system that's always good to go. Lately, I've just started getting to my shows extra early so I can set up without any stress.
I keep my basses in the house. One upright is set up and ready to play. The rest are stored in their cases, ready to go at a moment's notice.
My small rigs (Ampeg, Fender, and Polytone) usually stay at home, although I sometimes use them for quiet gigs; there's always plenty of gear at home for practice, recording, and such.
I keep two gig rigs in the car: my main equipment rack and Dr Bass 2260, and a back-up rack and EA VL208. Also kept in the car, ready to go, are several gig bags,containing music & fakebooks, recording gear, cords, cables, pedalboard & wireless, tools, PR kit, etc.
When it's time to go, I grab my Mapquest printout and a bass (or two), and I'm out the door. If I ever got to a gig less than thirty minutes early, I probably wouldn't be a happy camper. I often arrive more than hour before we are scheduled to perform.