So, the tarp is a bad idea?
It will attract critters even more than if just left open in the barn?
If I seal with a tarp, you're saying moisture can still enter the inside it is condenses from the air inside the tarp?
I paid $15 for the tarp already, is there any benefit in using it? Can I vent it somehow, by cutting a hole or slit across the top?
That way, most of the tractor is covered, but moisture is not trapped?
Also, would a large cloth blanket be better? Or would that attract mice even more?