lipo balancer q?

[stampy]

i plan on getting the new mrc 977 charger, and it can charge 2 3s lipo packs independently so i shouldent need a balancer right?
also i plan on wiring them in perallel in my truck so i can get longer run times do i need some kind of balancer for in the truck?
1 more thing will 1 3s low voltage cut off thing work on 2 3s packs (3s3p total) or do i need 2 of them?