I used to have a 1996 6X6 Atv by Polaris. It was only a 450 cc machine, but worked well. It had an all-chain-drive which was its weakest point, because the double axle in the back had a hard time keeping the back chain adjusted right. The other issue was its turning radius. A Tri-axle dump trailer complete with cabbed tractor could turn around in less room then that thing could, but Mercy Sakes, switch that thing into 6 wheel drive and it would go anywhere. The dumping box on the back was handy too.
By the way Smitty, you CAN buy front buckets for ATV's now. What they do is have a small engine power a hydraulic pump that actuates the lifting and dumping cylinders on the front loader.
The problem with all that is, buy the time you buy everything, you end up with a ATV that costs as much a small tractor, yet is not really designed to take the punishment that a tractor can. I say that because I TRIED to cut wood with that 6x6 Polaris. Here we can still sell pulpwood in 4 foot lengths, so I would put a trailer or scoot on back of it and load 4 foot pulpwood on it and haul it to the road for a truck to pick up. It worked, but the ground clearance was an issue, and you could just feel the abuse when you hooked onto a stump or root. It just jarred the whole machine. In 1999 I got my tractor and the ATV sat unused until I sold it.
Of course I say all this like everything I have must earn its keep, and yet I bought a $9000 dollar snowmobile that gets about 2 months worth of use out of it per year! That is an expensive toy.