We recommend contacting operators and providers in advance. You can also call to outline your situation and then add that you will be sending them a few questions by email or post. Written questions offer several advantages:
- You are less likely to forget to ask something.
- The clerk has more time to check with someone else or actually measure something, enabling better answers.
- You will usually receive a written reply, which can also serve as proof.
To avoid misunderstandings, it is recommended to bring physical copies of such agreements and confirmations along on your travels.