Thank you for that information.
Note that since 2018-01-01, Brussels is a low-emission zone. All Diesel vehicles that are not compliant with at least Euro 2 are banned from the entire Region. Next year, Euro 2-compliant vehicles will be banned as well, and also gasoline-powered vehicles compliant with Euro 1 or less. Each year the minimal requirement will be raised, until 2025 when all Diesel vehicles will be banned. See http://www.lez.brussels/ for details.
There is an exception regarding motorhomes though.
FOSDEM 2018 falls within the grace period of 9 months during which offending vehicles will be ticketed but not fined. FOSDEM 1019 will not.
In the city of Brussels, parking for camper vans, as well as for any private vehicle occupying public space, is additionally restricted to 24 hours: https://www.brussels.be/parking-camper-vans
(in fact, almost all municipalities restrict parking of any private vehicle on public space to 24 hours or less).
All right then I just move the car a bit after 24h ;) Oliver