My work van is about 1 & 1/4 parking spots long. We got a smaller van recently and it really is more difficult to fit everything for a big job. Luckily we work rurally mostly so parking is not an issue. Some industries really do need larger work vehicles.
For reference on our bigger jobs. We carry 300-500 foot rolls of piping. Once prepered for a job the roll has a diameter of 6-8 feet. We also need other equipment and materials as well as an overwhelming amount of tools available.
That's definitely worth having an oversized vehicle for. I'm not questioning that at all. The supersized pickup with an 8ft bed and seating for 12 is where the fuck cars frustration comes in.
considering the "bed" is just over 10ft long and about 6ft tall, I could fit most mattresses, as well as most normally sized couches in the back too. A single king sized foundation would need to be angled though.