Great topic guys.
Gil: You mentioned that a loose neutral can be detected by wide fluctuation between L1 and L2 voltage readings. I check the pedestal every time before I hook up and I see sometimes large differences in voltage readings between L1 and L2, particularly when the weather is warm and lots of AC usage in the park. I attribute that to the park Electrical design not evenly distributing the L1 terminals across both park lines and every pedestal L1 is connected to the same park infrastructure line. Which I assume is a bad idea for leg load balancing. By morning, the Voltages are mostly equal between L1 and L2 as the A/C units are off.
Is my thinking flawed somehow? How does a loose neutral play in this?