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Sunday I installed a hard wired Progressive Industries EMS in the belly of the beast and mounted the display unit in a cabinet face that I can see when I open the front door....right after powering up to shore power. Next, I took out the single 12V battery battery and started the install of my two 6V Trojan T-105s....golf cart batteries. I had to modify the battery box because the batteries are now inside the front compartment by the generator and hydraulics, and they need positive ventilation. I used a 1 3/4" hole saw to make a hole in the bottom of the box and another in the lid. The lid has a flexible hose attached to it that goes to a grill in the front of the trailer, and the bottom hole vents to the outside of the trailer bottom. Next job is to get my TPMS booster wired up to the trailer 12V and get that system working again. Six trailer tires to monitor now instead of four, so I had to purchase two more wheel transmitters.