Diagnostics is the absolute basics, before doing anything else. That and a good battery. So ensure your battery is tip top. If going somewhere difficult to get a battery, take a spare.
@Wazzajnr has two different diagnostic systems for sale at the moment. Even with postage the price will be more than competitive.
On top of this make sure you have good quality bags on EAS. Age and wear can cause holes that are found at the most inopportune moments.
Thanks for the tip! I will send a PM today.
I will renew all the bags and compressor before starting the roadtrip indeed since I have no idea how long mine are under it. + tires and battery + build in a secondary battery anyway.