I definitely wanted a backup camera. I did not have one on my 3rd-gen Ram and never knew where my back bumper was at!
I thought (assumed) all new Rams had backup cameras as standard equipment. Every 2017 and 2018 I test drove had one, and every window sticker I looked at had one listed, so I didn't really pay much attention when I test drove the Ram I ultimately purchased.
For some reason, just before I signed the deal to buy my truck, I grabbed the keys off of the salesman's desk and walked out to the parking lot to verify that it had a backup camera. I was stunned to discover that it did NOT.
I told the salesman: either install a backup camera or no deal. I was more than willing to walk away and he knew it. So, they installed one that afternoon and I went back the next day and finalized the paperwork.