F350, and a 450 gallon poly tank. Nearly all of the ranchers also use them to haul water for their cattle. Other people have smaller tanks in smaller pickups or on trailers.
The local markets also have R/O water dispensers to fill jugs for drinking water: $.50/gal. We have 4 250-gallon tanks in the basement for household use, and 2 5-gallon dispenser jugs for drinking & cooking. Culligan also does a brisk business.
There’s also a couple of companies that use 5 or 10 ton trucks, with 2 12-1500 gallon tanks to fill people’s home cisterns...but at $80/1,000 gallons (or part thereof), it only appeals to a certain clientele.
R/O water dispensers? What are those. Walmart has some sort of large plastic blue see through container that have water in them. But they are already filled.