I farm and would like a more stable 4-wheeler for traveling gravel roads. Currently have a 06 330 Trailboss that is a OK but a bid spooky on the gravel. It seems the Polaris Quads with struts in the front tend to be this way.

I had a 660 grizzly and that seemed perfect. I run flat north dakota roads thou.

Any of the 450cc race quads are very stable on that terrain. My wife will go 75mph on the logging roads around her on her YFZ450 because its so stable and low. If you need a 4x4, you can get aftermarket shocks from Works and they will make it much more stable not as much as a sport quad but better than stock. Also, changing tires to match your terrain will make a big difference too.