And that is the reason for the link that I posted to get a copy of the manual. Far less difficult to share the manual as compared to an amateur attempt to explain how it works.
That would have been my advice, had it not been for the fact that you indicated it failed sometime before this all began. The constant cool when it detects a shorted thermistor is there because the designers believe that frozen vegetables are a better choice that thawed out tilapia.
I decided to look up the Vermont defanition. Looks to me like a double dolly would be a trailer in Vt,
51) "Single-axle tow dolly" is a vehicle towed by a self-propelled motor vehicle and designed and used exclusively to transport another self-propelled motor vehicle which shall not be required to be registered and upon which the front or rear wheels of the towed self-propelled motor vehicle are mounted, while the other wheels of the towed self-propelled motor vehicle remain in contact with the ground. These vehicles shall not be subject to registration or titling nor shall they be treated as a separate vehicle when used in combination with another vehicle. They shall be subject to equipment safety requirements.
That only gives you 2"of clearance even if the specified height is accurate. It sounds like you may have a height that doesn't account for the air conditioner. I would start by getting an accurate height of the trailer.