Battery Fuse Blows When Plugged Into Shore Power

I don't know what anyone else would do, but in a matter of 8 hours I would be driving out of that dealer's lot with ANOTHER trailer in tow. Sounds like you have something colored yellow that you squeeze and make juice with. If a dealer who makes thousands upon thousands of dollars per sale does not have enough respect for his customer base and just pawns off parked units without checking them out thoroughly then something is wrong. A one hour check-out can prove more than 5-dozen "most commonly found fouled up systems".

Another rig time.