Hi,
Thanks for your message. The PDF files are always generated through an apposite template file, which can be edited from the Configuration page.
There is only one PDF template, but its content can change depending on the vehicle that was booked. You could actually place dynamic contents by using the Conditional Texts in the configuration page. This would let you create portion/pieces of content that will be included inside your PDF template only when certain rules apply, for example when a specific vehicle is booked.
This is the best solution for customising the PDF template. We invite you to get in touch with our team through our website should you have any technical questions.
The VikWP Team