Wow, looks like I should have done a search before entering my thoughts, as it looks like with the change in battery chemistry they have indeed increased charging voltage to a maximum of 16 VDC. I would review voltage input specs on any gear you were considering to install. If the gear can not handle it I would use a DC to DC convertor, but beware as they can induce noise on the DC power. Get one that is sell designed.
Yes. The tail for the brake controller is available. But like everything else on the car it will be 16 volts. Some ham gear today has wide range input power, like 8 - 21 volts. But you may need to drop it back with a converter. The biggest challenge for me is where to mount the thing. I thought about sacrificing the cell phone charger deck, I never use it. But then I remember that is the deck for the key card too. For the antenna, I can drill through the spline above the rear hatch. But rig placement is tricky.
I tried a lip mount on the rear hatch, but it worked quite poorly. The spline appliquè (looks like glass between the FWD) is plastic and can be easily drilled. You will need a long throw mount to secure it to the metal spline underneath. I found it quite difficult to get the hole exactly centered, so mine was off center a bit. But the antenna worked very well. I left the mount on the car when I traded it in. It had no impact on my trade-in. In fact, it never came up during the trade-in ceremony. I would do the same thing on my 2022, except I don’t know where up front, I could mount the control head.
