Ideally, the car should be loaded as it will be most often driven.
Years ago when I had my electric Wabbit aligned for minimum rolling
resistance, I actually sat in the driver's seat while the car was on the
alignment machine. They then set the wheels for as close to straight
ahead as possible. They gave it the very slightest touch of toe-in, just
to keep the wheels from shimmying. They also set the caster and camber
for optimal rolling resistance. Caster doesn't matter much, but camber
does. The wheels should be set with zero camber. (Vertical.) Zero camber
does make a _slight_ difference in handling, but I wasn't planning an
autocross. The low center of gravity in an EV reduces the need for
non-zero camber. It handled great, regardless.
I got out of the car after they were finished, while it was still on the
alignment machine, and you could see that the alignment changed without
my weight in the vehicle. I got back in, and the alignment moved back.
It makes a significant difference. (And no, I'm am not that heavy. :-) )
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