I'm posting this, because it's a unique quad and for anyone with mobility issues, probably a top pick because of the step-through design.

I don't know a whole lot about these, but the engine is directly under the seat, which means the seat comes completely off and the engine is very easy to work on. They have disk brakes front and rear. Push button shift 5 speed (no shift lever, button is on left switchgear). Radiator and fan is in rear, so no worry about ramming a stick through the front. I think this one is 4x4. Fuel tank in front fenders and there's a trunk in the front rack.

Seems like a great quad for specific uses and people. Even for someone with no mobility issues, if this was used on a farm or ranch where the rider was on and off of it all the time, the step-through would be nice to have.