I'm back, mostly, but busy with non-car things still. I really want to get my brakes and swaybar stuff installed ASAP, maybe today or tomorrow but we'll see.
The only really useful thing to report, is that after sitting in the garage untouched for 9 days (without a trickle charger), the PC680 in the trunk started the car fine, and the Lightning Audio 200 Amp breaker didn't blow
So yeah, trickle charging probably not even necessary on this setup, which is surprising but cool.