just to round out this thread...
I made a bracket bolted onto the bottom/side of my traxide battery tray to mount a winch isolator. It's a 500a Stinger isolator controlled by a switch inside the car. I really liked the manual+switch operated isolator Scott used but couldn't bring myself to pay >$600! The switch circuit is fused - not sure if it needed to be but it's got a 3a fuse there just in case.
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and I ended up going with a slim line number pate mounted above as I couldn't fit a thimble with a flip up number pate. i was also concerned it might come off in river crossing.
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