Roadside tips and tricks for alpine roadtrip

I’m planning an epic road trip through the alps with about 20 mountain passes in my old shitbox and I was thinking if something goes wrong I’ll probably have to bodge it myself.

Anyone have any tip and tricks for coolant leaks, etc? What should I bring with me other than the obvious fluids, spare wheels, toolbox? What are some common mechanical issues I should look out for?