Pelican cases are the bomb, and practically bombproof. Definitely waterproof. I would get one with a handle:
http://www.pelican.com/cases_detail.php?Case=1150
http://www.all-pelican-cases-4-less....can_1150p.html
The 1170 looks like a good size, if it fits the KT18 too..can anyone confirm what size is needed for the KT18 and 2-3 cars w/ charger?
http://www.caseclub.com/pelican-case-1170.htm