In reply to toasted:
I know this doesn't help much but...from a bragging point of view I once had 4 people, 4 rucsacs and 4 (old skool, i.e. small) boudering mats in a 3 door Fiesta on a drive back from Stanstead (I think) to Sheff on a Christmas eve (having just flow back from Font)...the car had no airbags, but with all those pads inside it didn't feel like it need them...
Luckily I was driving so I was pretty comfy...
Ah, happy days!