This series of trailer has a box on it that will accept a military 12 pin plug, or a civvy standard 7 pin plug. And the LED lights will work with 12 volt or 24 volt.
My trailer was delivered to me with the brakes caged, and is still that way due to the seller in Maryland not disclosing the missing air lines. All 4 brake chambers are caged.
The air lines are just standard red/blue 1/2" air line coiled up with a glad hand on each end. Available at most truck stops. Also you can purchase the cage bolts at NAPA, and they require a 3/4" wrench. You can purchase a civvy 7 pin inter vehicular cable at a truck stop, they are usually green, and have a plug on each end already installed. Be sure and take tools with you, you may need something to turn the jack handle with in case it is missing.
Please be sure and choose the appropriate sized vehicle to tow this trailer home, it weighs 7310 lbs. empty. Also take some zip ties, bungee cords and some small rope with you. These trailer have a ladder storage with a pin that fails to keep the ladder secured during transport. Tie it down good and you will still have a ladder when you get home............