Well I will qualify this and say I have a coupe. However, this past weekend I had a decent amount of music gear in the trunk. The list is as follows:

Behringer VMX100 2-Channel Mixer
Technics SL1200 Turntable (x2) - in their respective cases
Dell XPS M1330
Miscellaneous cables/ Serrato Scratch Live/ extra needles - in a bag


That was in their for a good part of the night. However, beforehand I had to drop a couple other instruments off at a friends house... So in addition to that there was also:

Fender FM-52E Mandolin - trunk
Yamaha FGX730A Acoustic Guitar - front seat
Yamaha CPX700-12 String Acoustic - front seat
Misc guitar acc. (i.e. strings, picks, tuners, string winders, tools, etc)

I got to my buddy's house and he was confused how everything fit.

Oh well, I guess it helps that I work for a shipping company that worries about getting the most goods into the least amount of space. CBM efficiency is everything. I'm a nerd.