[suicideneil]

Unless the lipos to be ran in parallel are lower spec items (in terms of mah or C rating), then a single high spec lipo is fine (or a pair in series to get the desired voltage).

I favour the parallel setup for extended runtimes, using a a pair of good spec lipos or A123 packs; weight is not a concideration for me, only nuttiness.

With a motor on one side of the truck, a single larger lipo on the other makes sense, but balancing the weight is more important/tricky perhaps...