lets see I don't much about new ATV's. most of the companies are pushing the side by sides and they are stupid expensive. yes they have 4wheel drive models. I will try to explain a few things. I used to ride dirt bikes so I will try to address that too.
there are basically three types of ATV's, 2 wheel drive, 4 wheel drive, and kids models. we will ignore the kids models.
so 2wd v. 4wd
for the most part 2wd's are meant to go fast that's how the make it through rough terrain.
for the most part 4wd's are slower, and heavier they make it over rough terrain by using 4wd.
most 2wd's don't have much in the way of racks or hitches.
4wd's have hitches and racks.
this is what first got me to try an ATV was the ability to carry gear. a dirt bike isn't of much use on a ranch but an ATV has become almost indispensable for ranches.
I like a manual transmissions I don't even know if there are manuals sold anymore on 4wd's
I built a dog box for mine now Scout can go everywhere with me. BTW I have built a few dog boxes for other people.
IMO you need a trailer that single wheel thing doesn't seem to heavy duty especially off road.
BTW Arizona will give you a license plate for you ATV making it Street Legal.
if anybody has any specific questions I will try to answer them. highdesertranger