I can confirm the ease of getting street legal in Utah. I've run all over the place with no issues.
In addition to signals and mirrors, you technically also need a lamp to illuminate the license plate (that came with the signal kit I used) and red reflectors on the rear (I put some adhesive strips I got from Lowes on the bumper). When I got my inspection, the guy specifically looked for the red reflectors. If you don't have a windshield, you are required to wear eye protection. You can get the title and safety inspection at any place that does normal automotive safety/emissions inspections. There is no emissions inspection required (street-legal ATV's follow the emissions requirements of motorcycles, which don't require inspections).
You are legal anywhere but interstate highways, and select highways in Salt Lake county (a "county of the first class").
Full details and additional requirements (e.g., tire size limitations) are here:
Utah Code Section 41-6a-1509. The Roxor is an "All-terrain type II vehicle" (
Utah Code Section 41-22-2).