We recently bought a camp in this will be our first winter with it. It uses a generator for electricity to fill the water holding tank. When we have closed it down after a weekend, we have poured antifreeze down the drains and into the toilet. When we shut down for the winter, we plan on emptying the hot water tank, turning off the pilot light, emptying holding tank, draining all water lines and then putting the antifreeze in the drains as well. Anything we are missing or any suggestions? Should we be emptying the holding tank and hot water tank after each weekend? Thanks for the help.