Even simpler solution - show some respect at a trip being private and don't try and beat the system.
It clearly says at the top of the trip page "This is a PRIVATE trip" highlighted in yellow.
Winston, I’m all up for an argument :). Why not remove/block any member who joins or adds themselves to a private trip.
The only private trip I ever see is the 1 that for some reason is always on the main trip page, the exclusive annual ranger trip (which should not be posted where it always is)
I hope 4wdtrip doesn’t end up like clubs-full of snobby anal sooky members.
I hear far too often, oh don’t go on a trip with him/her bla bla.