It does not take much explaining. Cash or Bank transfer and in the case of bank transfer seeing that money is in your account.
The choices are shown on listing and there is no question of being paid by paypal as it is not safe.
You only part company with caravan once you have been paid.
To avoid unnecessary fees through having to relist because of Non payers, classified ads. are recommended as you do not close until you have been paid.
https://www.ebay.co.uk/help/selling/listings/listing-tips/selling-classified-ads?id=4167&st=3&pos=2&...