As I mentioned: A typical camper van is borderline at 3300 kg already so you have 200 kg for cloths, food, water to drink, bedding, etc. It even matters whether or not you gained 10kg during winter or lost 10kg.
16kg equates to about 2 lithium ion 100WH batteries 1-2 bikes for bike tours 1 grill + extra gas for a barbecue
etc.
So you can decide between those or a conventional solar panel or you just pick panels that weight less then you can have both.
I doubt anyone will ticket you over being 10 kilos extra...
On top of that you could probably pick any other part to make lighter and come out cheaper than buying fancy solar panels
It is not about + or - 10 kg. But things definitely add up. 10kg here - 10kg there.
Solar panels is something that is under the control of whoever buys the vehicle. You have almost no influence of the vast majority of what makes up the van.
You also risk insurance issues when your car is over weight.
Believe me - weight is definitely an issue.
The weight is usually determined by 4 scales (1 for each wheel).
Then they look at your papers which also includes information about max load at the front + back.
If you are over weight you have to get rid of the additional weight and if you can't they will seize the car. You get fined. It does happen.
It happened to me twice in Germany, once in Norway and once in France.
I read an article about it in Czech a while ago, so I don't have a link at hand, but you should be able to find it easily.
Also it’s 200W/m2 but camper roofs are a lot more than 1 square meter so you just cover a larger percentage of the roof with solar.
If efficiencies were within a few percents.. sure.. but when we're talking about a factor of 5+, it doesn't seem to be worth it.
5% efficient cells only make sense if applying them is about the same cost as paint and in applications like highway barriers or walls.
Camper vans usually get very close to that limit. Even if the van has only 2 sleeping spots. Weight is definitely an issue there and most camper vans sold these days come with a solar installation on the roof.
With 100W of solar you can expect some additional autonomy as a camper. 200W is considered more than average solar for small camper vans in the EU.
A typical 200W solar panel weights in at around 10-13 kg + maybe 1-3 kg for the additional bracket.
11-16kg is something you would think about.
Thats also the reason why flexible panels are already used for some camper vans. They also have the advantage than you can put them on un-even surfaces.
The VW Grand California for example can be ordered with a flexible panel at the front side:
https://de.wikipedia.org/wiki/VW_California#/media/Datei:VW_...