Hauling grain--hmm. You drive a whipped-assed old tractor that is parked all year with mice having orgies in it. The tires are rotten recaps, the air brakes are scare-brakes and the guy driving it has no clue about the adjusters. And it's fun because you don't do it very often so you beat it like you stole it (more often than not it's an old Detroit and it sounds cool so it's hard not to drive it like an ass) and the rest of use hide during harvest season so we don't get killed.
Two-speed axle is easy. Flip the switch, let off the gas and it thumps into the other speed. It's harder to do empty because you go through the gears to quickly, but loaded when you spend some time in each gear, it's no problem because you need that gear and the truck is good and ready for it. I use the Gear Vendors in my pickup the exact same way.