About APK duty and the real inspection cycle: which statement is WRONG?
'you do not need to be able to show that during a roadside check. The police can look up in a system whether your vehicle still has a valid inspection certificate.' No duty to show it — but there is a system check.
RDW (not the book) - diesel/gas has its own, shorter cycle: first inspection already after 3 years, and annually from then on.
The same rhythm applies to every car: first APK after 4 years, then after 2 years, then every year — regardless of fuel type, and this rhythm never changes.
'Both the owner/holder and the driver of the vehicle are responsible (and therefore liable) if driven without a valid APK.' Both are liable, not just the owner.
Explanation
RDW (not the book) - the real rhythm has two branches. Petrol/electric: 4 - 6 - 8 years, then annually. Diesel/gas: already after 3 years, then straight to annually — no two-yearly interim phase. VekaBest p.206 names no interval figure at all; the '4-2-1-1 for every car' figure is the trap.