Corn, wheat, and other farmers have separate vehicles to accomplish the tasks necessary for their farms, e.g. a combine harvester, seeder, iriggator, etc. I know they also have large spacious trucks as well, but my point is that it is feasible to expect an agricultural business owner, or any buisness owner, to have different commercial equipment for different tasks related to their industry. Besides, whereas all the people who need pickups for their business have them, not all pickup owners need their vehicles for business. I see many, many large pickups parked in residential areas of the city and around the suburbs. The closest most of those people get to agribusiness is going to the grocery store. That's the second point, if you don't absolutely need a large truck for business, you shouldn't use one for your everyday driver. Imagine if big rigs were affordable for most everyone and people used them for daily driving.

Might be lactose intolerance. Try taking some lactase enzymes prior to eating next time you have it and see if it helps.