No clue about the durability of that unit- but I can say we've had several different utv's and they're the handiest damn thing on a property. From grandkids, to beer runs, and full on work they get more hours of use than any of our tractors.
Yeah I would say you'd want a trailer you're firewood if you can get to places where the terrain would allow you. Maxing the payload in that unit with that suspension is going to wear it down both in the suspension components and the drive train much quicker.
My uncle had a hi sun almost identical to yours and used it a long time and had no problems with it. Sold it to the neighbor who is also happy with it.