I agree with all you said.Tinting taillights should be illegal. Anything that reduces the brightness of the lights. That is precisely why the Mopar units keep the lighted area clear/enlarged. This is a foolish mod done incorrectly and does deserve a ticket. I live in a very foggy area and every lumen counts!!
How'd you remove the drivers side interior trim panel to access the spring nut? Looks like a pain.I purchased the dark / smoked taillights for my wife's Stelvio from Mopar Online Parts.
Scopeman posted instructions on removal / replacement in this thread: How to remove tail light?
The easiest of the four lights to start with is the outer / side light on the passenger side. Locate the access door to the rear fuse box on the interior side trunk trim and turn two releases to remove cover (picture). Once cover is removed, look for white spring nut (picture) and remove it (picture). Next, move to the exterior of car and slide the light toward the rear, the light slides on and off of two round mounts in the car's taillight recess: one on the top of the recess toward the rear and one on the side of the recess toward the front (picture). Once you have access to the wiring harness, pinch the upper portion of each of the short sides of the harness (picture) to release the tabs holding the two halves together and wiggle /pull the harness free. Once this is accomplished, the stock light is completely free from the car.
Attach the harness to the new light and slide the light in place, back onto the two round taillight recess mounting points. Move back to the car interior, reattach the screw nut and put the fuse box access door back into place and you are 25% done.