Agreed; in that sense a big speaker box is "mobile," but a good number of times I'll have to haul a ton of boxes or such around from building to building at work, and it's not always convenient to unplug and stash a 50 or 60 pound Box of Boom. I had a pair of 15s in my old Blazer that I installed with that intention and found that after the first couple of times it became too much of a hassle (read: I became too lazy) to schlep the box in and out of my truck. :violin:
So, this time I'm going the custom route so that I've always got some sound with me when I go places; plus, as you said, it's definitely cooler :cheers: