Not quite a 100 series, but I am having a similar dilemma with my 120 Prado, latest thinking is going one of the GME 3540s and putting the main unit in behind the panel to the left of my left knee and putting a plug in one of the switch blanks in the console so that I can just unplug and put away when I don't need. Knowing the 100 series and 120 are similar(ish) in a lot of respects (Prado is just smaller), I would suspect you could do something similar.
Cheers
Rod