I've had all four generations of the Tacoma and have driven pickup trucks for fifty years. My new OR handles washboard like no other vehicle. The suspension is incredible.
I started to, but it's a bit of a bear, and it really isn't needed. Here's a shot of the digital mirror (camera) looking through the topper after zooming in the mirror settings. You do lose some visibility.
I had my bed lights on last night. Works great. There's a window that allows the (white) light in the third brake light to shine through. You can see it here:
The lights in the bed, work fine.
Inside my Smartcap, does that work? (Probably not...)
I used this bracket, and they are great. Perhaps that'll work somehow. (This page doesn't allow an Amazon link.)
New Multi-Purpose Aluminum Adjustable Fire Extinguisher Holder Mount with 8 Clamps