We had almost the same issue with a new CC 36CKTS last summer. Plugged the trailer into the same plug we had been using for a couple years at the house with a TRC surge protector and fried the inverter, converter, vacuum and satellite receiver.
Had an electrician come check and he found an open neutral at the end of the power cord that goes into the trailer.
We took the trailer to the selling dealer FunTown RV in Cleburne Texas and it sat for about a month with constant conversations of we will get it in tomorrow. They finally called and said it was ready, when we got there nothing worked, they actually hadn't done anything. One of the managers came out and apologized and we tested the cord and confirmed it was bad. They replaced the inverter and converter and said to give them the receipt for the new 211Z and get FR to reimburse me.
They sent the cord to FR and they said there was nothing wrong with it and all damage must have been my fault and they were going to deny any and all warranty claims for electrical on the trailer.
Now I get to tell this story over and over to warn people to never buy a FR product.
P.S. We have a PI EMS-HW50C now and haven't had another issue.
2015 Ford F350 CC SRW LB 4X4
2016 Cedar Creek 36CKTS (My Last FR Product)
20,000 LB Reese GooseBox Hitch