The trailer is used in commerce and is illegal under numerous provisions within the Federal Motor Carrier Safety Regulations.
All trailers with a GVWR of over 10,000 lbs and more than 80 inches wide are required to have conspicuity marking covering 50% of each side and across the back (a little more detailed at the rear). THis is the red and white reflective tape that you see. There is some on the side, but none at the rear.
Each vehicle of this size must have rear under ride protection or have the wheels or other device at the rear that prevents a car from going underneath it. Well, maybe not prevent, but definately slow them down. On a trailer, let's start with it must be no more than 22 inches high and within 10 inches of the rear of the trailer. There are ways around this, but this trailer meets none of them and the under-ride protection is clearly way more than 10 inches from the rear of the trailer.
Though the pictures are not entirely clear, there appears to be a single safety chain between the power unit and trailer. Except for a bridle arrangement (which this does not have), there needs to be TWO safety chains.
From the pictures at the rear, it would appear that there are unsecured items in the bed of the truck - specifically the white barrel with the handle.
Other than that, looks great...
angela