I had an early King Quad and it was a nice riding machine, but I am not too sure it would be a great working machine. We also have two Honda's that my boys have and they have been used only for fun riding. Lots of miles on them and still going strong!
You might want to take a look at the Polaris machines, many of my friends ride them and like them. Most of my riding was done up in northern New York, but recent years there has been a major shift in many towns to stop the 4-wheelers so if you don't belong to a hunting club it is hard to find places to ride. I do belong to a club and there is 18,000 acres to ride on, but after awhile it gets old going to the same places.
Lot of people use them for work and not for riding fun, but I on the other hand feel the work I put mine to is very limited.
Pull the log splitter: I used it for awhile to pull it into the woods and back, found I had to adapt a different hitch so as to easily get it on and off from the 4-wheeler. Also I could no split wood while it was attached to the machine.
Pull trailer with load of wood: Hre again I found that it was limited as to how much it would pull and how much weight you can place on the tongue before the front wheels start losing traction. Much easier to do with the tractor and a good size wagon!
Plowing snow: Bought a plow for the front end and used it during one snow storm. My thumb froze up thought I had frost bite! Ended up buying hand and thumb warmers and then sold the plow.
It did the job and would push snow, but the problem is the tractor does it much better and faster.
Garden cart: I still use them to pull the garden cart to and from the garden. Keeping in mind I do have a JD garden tractor that would do this job and maybe do it better.
Get the Mail: Mail box is about 1500 feet from the house so on nice days I might just jump on the 4-wheeler and get the mail, fun having a convertible!
Bottom line is I don't think 4-wheelers are all that good as a workhorse. Yes, people will tell you all the things you can do with them, but the bottom line is most people just ride them.
Any tool you buy for one is extremely expensive, just look at the mower deck with an additional engine or even the stupid snowblower with a second engine hooked to the back of the 4-wheeler. Heck buy a nice tractor with a cab, heat, air, CD player and you will be much happier on your land working away.
just my 1 1/2 cent!
Wayne