Work vans are the superior work vehicle for the majority of use cases. Lower bed/floor height to make loading easier. Covered rear so your tools/product doesnt get wet or dirty. Able to carry a ton of equipment, taller models you can even stand in and use a workbench in the van. The side of the van is large and flat making it easier to print large letters and numbers to advertise the company. Most modern work vans have better visibility than similarly sized trucks.

Yeah I'm no mechanic but I think it's from the way their doing the suspension to increase tow load. I can't remember the truck models but it was the largest model vs the 2nd largest model had the exact same engine size and sp3cs but the larger truck had a way larger low weight than the other and I was told it all came down to the differences in the transmission and suspension. I 100% agree tho I have worked jobs that had trucks with beds that were so fuckin stupid high it turned loading/unloading to a 2 part or 2 person task. Once onto the tailgate. Second to move to front of bed when normally we could just give a good toss and load the truck in fraction of the time.