Well that is definitely not expedited. Document your calls and contact and file a dispute with your credit card. At the absolute minimum they should refund expedited service.
Wow that's wild. I have 35" KO2's and it is rock solid. Doesn't even rattle on bumps or anything. I think you are the only time I've heard of a JL tailgate twisting.
The camera does not have sensors. The sensors are in the rear bumper. If you're getting false positives, you need to find a way to move the spare closer to the tub and higher. Relocation kits can work but are hit and miss depending on too many variables. Teraflex Alpha is perfect for this...
The Mopar tailgate reinforcement is to help tailgate flexing and helps distribute the weight. It's fine for 35" and under. I'm curious if anyone has actually had their hinges fail and at what weight.
Hell no. I want less problems in my life, I'm not going to pay to have more headaches! I've only had to go to the dealer for one issue (corrosion paint bubbling) and that was horrible experience.