RE: what kind of 4 wheeler do you use?
I use a Yamaha Grizzly. Sorry I don't have any pics to post.
My experience with it has been good. I bought it in '03, and have put about 5,500 miles on it. I like the liquid-cooled engine, the headlight configuration (keeps front rack usable after dark), the engine break, the selectable 4WD/differential locks, and the independent front and rear suspension. I've done a lot of spot spraying with it, and I have found all these features come in handy for that. The liquid-cooled engine stays cooler than an air-cooled engine when you are doing things that require you to go slow. With the engine break, I seldom use the wheel breaks. Being able to kick it out of 4WD allows me to turn sharper than a machine that can not, yet I still 4WD when I need it. Independent front and rear suspension helps take some of the bumps out of the ride, and with a spray tank on the back, it keeps me from accidentally bending or breaking an axle when I run over objects hidden in the grass.