Some more information: 1) NONE of the wires on the bus are loose at all, it takes quite a bit of power to loosen them 2)Air conditioning and electric water heater not on since last year 3) Trailer has a hard wired surge guard and those screws, on both sides are tight 4) the screws on the new transfer switch connections were properly tightened. So I think most everything from pedestal to breaker box has been checked.
I can go to HD or Lowes and get a new buss, but not sure if there is much room for exposing new copper on the neutral side of wiring coming into the box. There needs to be some extra wiring remaining behind the box so that it can be pulled out to work on. I haven't pulled out the breaker box since I installed a new circuit in my storage area when trailer was new, so there may be at least a couple of inches. I hope so.
I can leave the breaker for the water heater turned off, but will probably need the a/c in the coming weeks.
