To remove a Kindle ebook from the app on my iPad, I just go to the library page on the app, touch the book I want to remove for a couple of seconds, and I get a prompt to remove the book from my device and it goes back into the cloud. I use Bookbub for most of my books. You set it up to send you the types of books you are interested in and they send you a selection of books every day. And the books are shareable with other devices associated with your account and the books are loanable although not all books can be loaned. Reading devices are a marvelous thing for RVers. You can even get magazines electronically and the price per issue is half of what you pay for a paper edition.