For me it's a couple things.
1 - I don't see the obsession with replacing every g-d battery with an optima. I've had lead acid batteries in all my trucks and they've never failed me when replaced at a reasonable interval or when they started showing signs of decay. My dad always used the same large lead acid batteries and it never stranded us in the woods either. I like the idea of having a plain old $80-100 starting battery that'll last 5-6 years rather than a $200 optima that may not even make it that long seeing some of the recent reports.
2 - I like the Columbia Overland tray, but they're dang pricey. I could probably build my own, but that would result in having to buy 2 batteries, rather than the one I need to add.
3 - I like doing something different, and I tend to stick to the KISS principle.
4 - It looks really cramped with the two batts in the stock location.
Carl
-2007 Tacoma TRD - Adventure toy and DD