I also have 40 acres. My electric carts are down for maintenance ... I miss them!
On 40 acres, you don't need to go very far so speed isn't an issue. That means most high HP solutions aren't necessary, nor is a high-range gearbox. Like their larger brethren there has been a trend to move "utility" vehicles up to "sport" or even "vanity" status. At a glance the quick rule would be "if they think you
should wear a helmet while operating it its the wrong vehicle. The electric cart travails at
Wheaton Labs, if I may, point to the problems of using a "sport" vehicle instead of a "work" vehicle - fancy suspensions aren't required and you don't need to have your camo clothes match your camo vehicle.
I second the nomination of OLD style JD Gators - the ones designated TS or TX with a small bed, 6x4 float tires (they now have a Gator XUV ... sporty, not utility). Add a bar and windscreen, and wear your seatbelt. Those big tires leave a small
footprint behind, assure all kinds of traction, and the bed that is open and low on three sides is realy handy for carrying the day's tools and supplies. They come in gas, diesel and even electric (apparently supplied by ClubCar).
Another fun option are the Kei Trucks. "Kei" is a designation in Japan for a set of rules for small vehicles, and they have all sorts of little trucks. Old ones get imported - often with shockingly low use - and I think Daihatsu sells new ones as property maintenance vehicles too.
Local availability varies - in the PNW they're all over thanks to Japan's proximity.. They might be road-legal, although the cab construction is paper thin and I wouldn't want a dust up with anything more than a tandem bicycle. They are otherwise tough, simple and reliable, using a small 600cc (~ish) motorycle motor. In Japan they are used for delivery, roadworks, fire truck (seriously), farms. I have one - it has a manual tranny with hi-lo and 4wd. And AC! It doesn't care. Only problem is I'm 6'4" and getting in and out is a human origami
project!