I also use the 701 Marine Batt Switch. We just drilled holes in the top of our current battery box and mounted it right to the top. We attached ours to the positive cables and brought over our powerjack to it as well.
It is very nice to know that when you want the battery cut off, it is completely cut off.
Nights camped in 2010 = 21 nights
2008 Chevy CCab 5.3L 4WD Z71
2008 FR Surveyor 291
Slpybear, Mrs Slpybear, Three Cubs