I just ordered a TON of Phoenix Gold stuff, and a new Avic Fseries

1) I am pretty sure I am going to use a second Battery. Its for car shows etc. I am debating between the Kinetik HC800 or the Optima Yellow Top. The Kinetik is a touch cheaper. How do they stack up against eachother? Is the Kinetik a Deep Cycle? Is one better for my 90A stock alternator?
2) I have a RSD 500.4 and 1200.1 on the way. Do the accept 4gauge power/ground into the amp? Whats the beefiest gauge wire they will take? I am hoping for 12 or 14ga to be safe.
3) How many fuses does the 500.4 have, and what amperage? I know the 1200.1 is 3x40a.
4) I am going to use the 500.4 to do all 4 door speakers. However, I want an extra set of RSD65C components in the hatch. This will be used with a TV at shows. How can I use these on one of the amps, and have them turn on when the hatch is open, and off when closed? I mean, I know I can use a third amp and wire the remote wire to the hatch pin... but would prefer not to. Also if a solution is that the rears turn off when the hatch ones come on, thats viable!

Thanks
John