40A MAXI Fuse is a must.
Fob batteries... although not 100% necessary, the fob will give warning before it dies, and you should be fluent in your security code.

 

Hell, see what gets replaced the most after you've had it a few years and carry some spares afterwards....
No need for OVM in them saddle bags unless its TOE.
for civilians thats dont drag around extra **** you wont use frequently.

 

I don't carry spare parts, too many "what if's". That stuff just takes up valuable saddlebag space and adds unnecessary weight to the bike. JMO

 

The spare parts I carry are because they have failed more than once for me. Of course I am used to riding 25-30K miles per year. I forgot that I also carry a spare jiffy stand spring!!

 

You gotta be careful with asking a question like this! If you carry everything we recommend your bags will both be full! Living in the UK I carry a comprehensive tool kit when on tour, as inch-size tools are as rare as hen's teeth over here.