Predator Motorsports offers a GPS locator and service. Call / email Designs N Signs for your decal.
Predator 'Black Box' I have a contact there so let me know if you are interested. But this is just for tracking / recovery purposes. Lowrance seems to be the GPS of choice for off-road.
Chris can draw something up or send him an image of what you want and he can mail it to you.
Cover the Trans Pan - Trust me I know
and the T-case could use some help. Talk to Yukon Joe about his belly plates
Look at what you might use tires for, but in Cal, you really can't go wrong, unless you travel up into the mountains and snow a lot. I would have Goodyear MTRs if I didn't have to deal with snow.