Semi trucks for the really rich farmers...
Need a late model Peterbilt with built in shower/toilet, stove, and 550 horses of Caterpillar power? Shelby can fix you up. Want a rig that needs 40 acres to turn around but will impress the lot lizards? He's got what you need.
The price for these rigs? Money is no object for those who feel the need to bake a sheet of cookies while hauling a load of corn to Eddyville. At $160K, you'll be riding like a king.
I'm being a bit silly here; there are probably owner/operators out there that enjoy these big rigs, especially when driving across country. My guess is that they've saved enough money to own one, especially toward retirement, and want something they feel is part semi truck, part RV.
However, it is often easy to see semis with large sleepers pulling grain trailers. If the point of having a grain hauling rig is to maximize the amount of grain on a load (thereby reducing the number of loads), then why waste space and weight with a sleeper? Get a day cab, aluminum wheels and lightweight engine and haul 1000 bushels legally instead of only getting 890. What do you think, Windy?