In mind you this is the AZ Statute ONLY, ARS 28-101.54.
"Trailer" means a vehicle that is with or without motive power, other than a pole trailer, that is designed for carrying persons or property and for being drawn by a motor vehicle and that is constructed so that no part of its weight rests on the towing vehicle. A semitrailer equipped with an auxiliary front axle commonly known as a dolly is deemed to be a trailer. For the purposes of this paragraph, "pole trailer" has the same meaning prescribed in section 28-601.
Just FYI, 28-601 is:
"Pole trailer" means a vehicle that is all of the following:
(a) Without motive power.
(b) Designed to be drawn by another vehicle and attached to the towing vehicle by means of a reach or pole or by being boomed or otherwise secured to the towing vehicle.
(c) Used ordinarily for transporting long or irregularly shaped loads such as poles, pipes or structural members capable generally of sustaining themselves as beams between the supporting connections.
The bottom line is....your situation is open to interpretation, depending on what the management wants to believe. The way I see it, this may or may not help. The term "designed" may not help, as it probably doesn't matter if it has wheels.
Hope this helps....sorry if it doesn't!