I have the Montezuma 41x18 mounted on the bed slider in my service truck. I go off-road a couple times a week to get to a few sites and everything stays right where I want it. It has room for all my standard sockets 1/4", 3/8", 1/2" drive up to 1-1/2" shallow and deep. And two sets of combo wrenches all the way up to 1-1/4". I really wish they made a heavier/deeper box I could put my 3/4" drive sockets and bigger combo wrenches in. My only complaint is the seal on the lid and the latch are kind of cheesy, but that isn't a big deal for me because I have a cap on the truck. My next truck I'll probably get two smaller 36x17 instead; one for metric, one for standard. I don't really see much benefit for stationary tool storage, but for anything mobile it's a game changer.
I'd post up some pictures of my setup but this forum platform appears to be from 2005 and I can't figure out how without like a photobucket account or something