What weight are concrete slats ? looking to make a wash area for the livery girls to wash their nags hooves so water is not running all over the yard in frosty weather would make it a couple of feet deep to allow the dirt to settle out before going down a drain, so would need to lift them up every so often to clean the dirt up, can lift 1.75 tonnes ok assume a 8 by 4 slat would not be that heavy? Any idea on cost before transport?