My advice would be try the stage/music/festival specialist firms for a start.
Flybynite/est/stagetruck/kbevents etc etc.
That will get your Europe and a bit beyond .
Money isn’t the best but there quite well looked after sometimes days of in European cities and away months at a time.
They’ll probably start you in uk work then let you loose. It’ll almost certainly better then gh’ing in Europe.
Generally as already stated it really is a some do some don’t gig. Some pay trip money, some pay hours, everyone’s different.
Do stobart still run to Belgium?