Trunk battery is installed and everything seems great! I used the DRL circuit since I don't have DRLs anymore, and it is hot in run only. This means whenever the key is in accessory the batteries are disconnected so I can listen to music all I want without killing the front battery. I swear the stereo sounds better, but I'll admit I haven't listened to it in a few weeks. Here's some pics.
3 of these holding the box in, battery drops right in at a slight angle:
I had a few different ideas on what circuit to tap into before I settled on the DRL...
Ended up using a 2 AWG wire off the truck for a ground, I cut it and soldered new ends on it, grounding at the same point as the Orion amp:
All done, almost:
Tomorrow I have to secure all the STB stuff in the trunk I loosened to move the sub around and put the back seat in, that's it...Then AVT box gets here Monday.