My friend have for sale (for 15 euros) good condition michelin trial rear tyre. Some time ago i was thinking about try to ride whit something like this becouse sunday rides whit friens looks like 40% forest roads with lot of tree roots 25% forest 15% sands (gravel) 20% big muds (marsh), is it sence to mounting this tyre to crm? Just for fun

I rode for many years with a Pirelli MT43 trials Tyre. In mud, it can be a little tricky, but you quickly learn to feel for grip, rather than roosting the low hanging branches. They last a lot longer as well. Also nicer on the road. Easier to change as well.
Mike