currently doing the relay upgrade, with the instructions from vanagon.com.
what i am wondering about is fuse sizing on the new wire from the battery to
the relays. i am  going to run 80/100w H4s for now, so i suppose i need a
toatal of 160w in low beam mode and 2x100 + 2x55 = 310 watt in high beam
mode (am I correct in assuming that in high beam inners and outers run
simultaneously?) my new wire from the battery is 12awg (dont have any ten),
fused with 30A at the battery, giving allowing 360W.
Am i overstraining the wires / fuses here? I was considering running two
12awg wires through their a) separate fuses to gain more power or b) through
the same fuse just to beef up the wiring. Option C would be to run one wire
and fuse to high beam  and one to low beam, which gives the system some
redundancy.
How is everyone else doing this?
thanks
flo