The Forest Knolls Trailer Court, one of West Marin’s last spots for long-term mobile housing, appears to be for sale, a listing that has drawn the attention of Marin’s Board of Supervisors. At their meeting Tuesday, the supervisors recessed into a closed session to discuss a price and terms of payment to present to the current owners—LBB3, L.L.C., a company registered to Petaluma dairy farmer Rebecca Lepori. “The county has expressed an interest to the…