On the ceramic coating, you are much better off finding a reputable detailer. To be done correctly, the truck must be properly washed, decontaminated, and polished at a minimum (more than likely a minor paint correction.) All that before any coating is applied.
Kinda depends on how mechanically inclined you are. Here are the instructions for 3g. Can't imagine it's much different.
https://toyotaparts.sparkstoyota.com/install/PT949-35220inst-tacoma-2022-23.pdf
I auditioned this system yesterday and was underwhelmed. I only tried the sat radio. In my wife's 5.0 with the Bang and Olufsen system, I typically listen to FLAC audio on a thumb drive, so I am spoiled. Even my JL with very loud road noise, sounds better. Of course, both of those vehicles...
I've seen Wind Chill Pearl but not Ice Cap so I can't comment on the differences. Ice Cap is a two-paint process, base coat/clear coat. Wind Chill Pearl is a three-stage process. It adds a pearl coat. This gives it an iridescent look and upcharge in price.
The old adage "there is no replacement for displacement" may no longer be true for engines, it still is true for audio bass. There just is not enough room inside of a mid-sized truck. I wouldn't be surprised if JL came out with a Stealthbox to fit under the driver's rear seat.
I heard the...
My dealer has a black OR and it is gorgeous. My wife's Mustang is black which I obsess over, so another black vehicle would be a pass for me. But damn, it did look good. Given Toyota's soft clear coat, a good ceramic should be considered (not by the dealer).
Why limit rear lock to 4L? Probably because of the number of people who are not familiar will lock on snowy/icy roads (particularly with a crown) and end up in a ditch. My Jeep has lockers front/rear. The only time I used them is offroad and the occasional rear lock for donuts. Mmm, donuts.