I also suspect that the power fill line runs close to the frame in the "basement" if you look under the slides you will see a 3" hole where the hydraulic ram comes through the frame, big hole. In cold weather you should stuff some sort of insulation in it, also the belly is screwed to the frame, mine had hugh gaps between the screws, cault that. If you really want to get into it you drop the underbelly off the frame and add insulation along the inside of the frame and more in the underbelly. Big job but it helps for winter operations.
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