I have a 100 gallon waste tank and an 80 gallon freshwater tank. At approximately 8 lbs. per gallon that is a potential when full(not often) of 1440 lbs. plus the weight of the tanks. All my appliances put together do not weigh that much. My tanks are centered over the keel from midships back to firewall to engine compartment but I have a Gibson with a shallow bilge below the floor. Peggy generally knows about these things and you should rely on her call.