Use BIG wires in the shortest run possible from the panel to the controller, and short wires from the controller to the battery. Crank the volts up on the controller so that you're getting 14.8 to the battery so that the battery can get fully charged and not just 80%. Then use the electricity like it's freely raining down from the sky, because it is :sombrero: You can read until your heart's content on this blog but here's a quick start
http://handybobsolar.wordpress.com/rv-solar-quick-answer/
Is that a 2UZ-FE in your LandCruiser? Same as I have in my Tundra, what a fun motor. Loves to rev.
I love the Turtleback logo too, nicely done.