We will be doing a road trip through Czech republic, Slovakia and Poland. At some point we would like to do a multiday hike through the tatras. Since we won't be carrying all our camping gear and other car luggage we will have to leave it in the car. Where can you park best to prevent finding your car being empty upon return or worse without wheels?

I am not asking for specific places, but more a general approach. For us it doesn't matter if we start the hike in either Poland or Slovakia.