Your tow vehicle lights must be on for the rear view camera to receive power IF THE CAMERA IS CONNECTED TO THE CLEARANCE LIGHT CIRCUIT. That does not work with only the "daytime running lights". If the tow vehicle tail lights are not powered on, the trailer clearance lights will not be powered on, and the camera which runs from that power source, will not be powered on. So, typically, you've got to switch the headlight switch to ON for the running light circuit to get power.
Then, depending on your tow vehicle, there may be no power to the trailer rear view camera caused by the way the tow vehicle provides clearance light power.
Chevrolet and GMC trucks built from around 2020 and more recent use a modulated clearance/running light power system. It's intended to reduce power consumption (part of the fuel mileage restrictions compliance). There is an adapter cable assembly that you an add to the vehicle to change the modulated signal to a "full power signal" which will run the clearance lights and provide adequate power to the camera.
If you have a recent GM tow vehicle, it's probably not the trailer that is causing your rear view camera problem.
As for the propane, cost is likely around $15 for a 20 pound tank and $20 for a 30 pound tank. Only you can determine whether it's worth towing the trailer back to the dealer for them to fill the tank, drive there with the empty tank for them to fill or call them and inform them it was empty and see if they offer to pay for a refill closer to your home. Spending all day hitching, towing the trailer there, getting $20 in propane, then towing back home and parking/unhitching the trailer, when you consider your time and effort, will likely cost you significantly more than just taking the empty propane tank to the nearest refill station and paying out of pocket.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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