Like most motorhomes and caravans there are quite a few external lockers some with multiple locks that should be checked that are locked before any journey.
Trouble is some lock key holes are vertical and some are in a horizontal position when locked.
So I have placed a thin piece of tape (some old pinstripe I had left over for years) on all the lock barrels so I know that they should all be in the horizontal position prior to setting off.
Simple and convenient.