
Personally speaking I think its a combination of factors. Mentley farm is is a bit of a way to travel to with a below average site compared to other sites and is relatively close after Easter.
Not in my case but it might be a weekend off roading at Easter means people have to/want to spend a weekend with family and/or doing other things.
Mentley farm is not exciting enough for trialling for me. As a base for a weekends camping with some greenlaning and a social event seems more inviting.
In short not a particularling good trialling site.
Sorry, especially as we need more sites.