Most are not even chores, instead think of these jobs as preventative maintenance and make them part of your RVing routine. Never let the attendant overfill your propane tanks or cylinders. This allows the gas inside to expand in the warm sun. Cylinders are normally filled by weight and as soon as the arm of the scale dips, have the attendant shut off the supply. Many cylinders have a spit valve that indicates when the level inside the tank rises to the maximum permissible.
New tanks have a built-in stop fill valve that prevents overfilling.
On a hot day an overfilled tank will vent excess gas. If this gas vents to the outside air, it could set up conditions for a fire. You may cool the tank or cylinder by pouring cold water over it until the venting stops. Then you should get rid of the excess gas by lighting an appliance that uses large quantities of fuel, such as your furnace or hot water heater. Cylinders on the trailer tongue should always be covered to keep the heat of the sun off them.