Off Topic -
Hey Leftyguns the quote in your sig is not from Abraham Lincoln. It is often mistakenly attributed to Abe.
On Topic -
No need to upgrade the battery based on what you've outlined for your needs. The stock Panasonic battery is excellent.
I do not have 1st hand experience but I've heard Walker's have a tendency to need to be rebuilt often. If it were me and I wanted remote reservoir shocks I would lean toward Icon. If you don't need remote reservoir I'd go with Sway-a-Way (SAW) or ICON.
HTH
Your 285/70-17 tires are roughly equivalent to a 33" tire. A 265/70-17 is just shy of a 32" tire. It doesn't sound like much on the internet, but it real lift the 285 is noticeably bigger, hence the need for the trimming.
HTH
I'm very interested in hearing an on & off road review of the new MTRs. After you've logged a few hundred miles, please post an update to the board.
TIA