If you really need it to be secure and private, and are communicating mostly with known acquaintances within a reasonable radius, with low bandwidth requirements, LoRA with encryption is the best bet.
It is a higher bar of entry but at least you can be confident your messages won’t be intercepted in any useful form.
This is and has been a big deal for a while. Do we really want easily trackable movements on every major road? What happens when they start feeding that data into federal fusion centers for cataloging and storage “just in case” they need it later?
What happens when a regime that criminalizes dissent has access to realtime vehicular and individual (via mobile phone) tracking data?