I left The Netherlands for good 13 years ago but what I do remember is that more and more unpaved roads got closed for all motorized traffic. So I suppose that by now with all those environmental freaks it didn't get any better.
There are some companies which are offering 'adventure rides' on their own property. Or off-road clubs which offer you the same opportunity. In most cases you have to pay by the hour.
Don't forget that The Netherlands is a very small country (41.543 kmˆ2 / 16.039 miˆ2) with 17.084.719 (2017) people living there so they want to protect what's left of 'nature' !
The USA is somewhat bigger: 9.826.675 kmˆ2 / 3.749.100 miˆ2 :wink2: In other words the USA is more than 233 times bigger than The Netherlands!
Population density of The Netherlands: 410.03 residents/0.386 miˆ2 ; USA: 91.5 residents/miˆ2.
So ........ need I say more about 'trail riding' possibilities in The Netherlands?