A proposal to put an alcohol rehab center in Camden drew an overflow crowd last night to a town planning board meeting. A majority of the people opposed the project. Fox Hill Real Estate is asking for a zoning change to allow a residential property on Bay View Street to be used as a high-end treatment facility. The center would have 12 beds and average eight to nine clients at a time, with privacy and anonymity a top priority. Developers say folks at Thursday night’s meeting expressed concerns about who’d be coming to the facility, added traffic to the area and paving the way for other zoning changes in town. Supporters of a similar facility started in Massachusetts seven years ago were also there. They said they had many of the same concerns, but none of them panned out. The planning board is scheduled to do a site visit next month and follow up with another meeting. Then they’ll decide whether to recommend the zone change to the town select board.