No one wants to carry a 10 tons rol of steel in a sports car. The majority of people getting a PDF on their phone though, do want to be able to read the information in it easily and they can't.
I don't know much about steel coils, and I'm hoping that something that fits in your back seat isn't as dangerous as those featured in YouTube videos, but the idea that the primary concern is just strapping the thing down is kinda funny
It is, but the UX trying to read a A4/letter sized PDF document on a phone is absolutely horrible.