The 16A is the maximum the plug is rated for. Very unlikely you use that much.
In many French campsites you are limited to about 6A. Most campsites don't have enough power for everyone to take more than 10A.
To be killed by reverse polarity, you also need to grab an unisulated neutral wire. It takes a special sort of stupid to do that.
Don't touch mains connectors, children.
In most countries, everything is double pole switched by default.
Euro plugs are reversible, so the concept of reverse polarity isn't a thing.
If you have an RCD in your mains supply (normally in the bollard even if you don't have one in the van) you are protected in any case.
What you do need to worry about is voltage surges. When you are on a shared supply where neighbours have inductive or rotating motor loads, a break in the supply can cause a surge big enough to fry electronics, such as in the fridge.
Quite often on French sites several vans are connected to one point using adapters. This makes the risk of surges higher.