I do heavy equipment/industrial/marine maintnace and fabrication work. The ability to overhead load things into the bed. Rather than being limited to what is on a pallet with a forklift. Being able have cargo that is longer than the bed of the truck and not have to drive with cab doors open. Being able to install a 5th wheel trailer to tow more than what the standard ball hitch allows. You shure aren’t going to make a tow truck out of a van. Bulk cargo? Just show up to quarry or dirt pit load a bucket full or 2 and of you go. Lots of reasons. These are just the basic examples. There’s lots more. From welding rigs to just being able to put a skid of drywall in with out hassle.

Miller trailblazer 330. I scrounged and worked ot like a mad man to buy it before this bs started cause paying an extra 3-4k just because. Well fuck that.