Hi, I am thinking of buying a spool of 8 gauge low voltage wires to
use with my Malibu 600W transformer for my yard. Will the 8 gauge
wires be too hard to deploy since they are so thick? Also will the
cable connectors that come with the Malibu light fixtures be able to
clamp around the wire and penetrate the sheathing?

I am using 12 gauge at this time, but the lights are pretty dimmer
since the total length is about 70'.