One trick I learned years ago and will continue to use involves using the tongue jack. After your initial set up between vehicle and trailer you will always use the same link in the chain. Mark that link with a little paint, elevate the tongue/car with the tongue jack, install your chains and raise your tongue jack. Creating that V between the car and tongue takes the load off the chains where you attach them to the tongue brackets and makes flipping the rockers to the lock position much easier.
Randy
