Anyone have a pet (dog) boarding ramp they would recommend? I'm not on a floating dock and the tide varies 3-5'. It would be nice to find something lightweight that either collapses (or folds) and is easy to stow away. I've seen a few things online but they're typically 4-5' long. This is to get the dogs to walk from the dock to the boat -- not something I need to get them back into the boat. Thanks.