My 2¢:
Don't take too many lenses, when I had a set of more than three lenses per body on any major outing (I shot a few weddings on film with a thread mount camera) I found myself missing a few shots because I was changing lenses. (Please note that M42 mount lenses are slower to swap out than bayonet
) My fix was to carry more bodies, with each one connected to a given lens. On a trip to Yellowstone, back in the day, I had three bodies with three different emulsions and at that time I had only three lenses so it was not a big deal. I suggest that you carry a wide angle, normal and short telephoto as that would cover most of the wedding required action.
Just remember, you have to be flexible and quick enough to catch the important pictures and the people you are shooting don't really care about your equipment or your art. They are interested in your ability to document their day and in the end their day is what it is all about.
Now, why are you concerned about the K-1II? It seems to be a pretty robust body so it should hold up all right. Unless you get a chopper pilot who flies by "feel"
.
Anyway, have fun, say hi from all of us here, breath and squeeze the shutter, trust your equipment, don't drink too much and don't fall out of the chopper as that would be bad. It's been a few years since I was on vacation in NZ, I still keep up with the news, weather, cricket matches and such. Beautiful place, nice people, great beer, good food and lots of birds (I like the bell bird). Please note that most if not all of us would like to tag along and we are jealous.