I'd be surprised if you had AC circuit protected by a fuse so it's most likely part of your 12V so it's probably the lights in kitchen/batch and the 12V to the fridge and not part of the problem. I'll bet cycling the AC breakers was the magic. A tripped breaker can be hard to spot, the paddles on the breaker will sometimes barely move when the breaker trips. I have more luck finding a tripped breaker by feel than the way it looks (probably need better glasses). If it was not resetting a breaker that got you back to normal maybe there's something going on with the converter. Anyone know it these things have some form of overload protection other than the breakers or maybe an over-temp protection?
I'd also replace the stuck fuse, maybe gently coaxing it out using pliers (disconnect from shore power and disconnect the battery first). My worry would be that it is not making the best contact and has "welded" itself into the fuse holder.
What model and vintage is your TT?
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks