Do I need any documents from my mother's doctor that says she needs a wheelchair? He cleared her to go and told her to have a good time! She will probably use it mostly to get on and off the ship. The reason we are bringing it is because she has lingering stamina and balance issues due to a lengthy hospital stay after open heart surgery with lots of complications last year, the least of which is that she still only has a whisper as her voice volume. Thanks for any help!