I have a Tapo C211, classed as a dog camera, baby camera etc, if there is any movement where the camera is you get a notification on your phone, everything.
is recorded on a SD Card or you can pay for 12 months Tapo care, this still records to the SD Card but is also kept online, useful because if someone stole the van they would have the camera and card, but you still have a recording. £20 from Amazon, it has to be on 240v which is the only downside, I haven't bothered with checking if it can be connected to 12v because I have 240 in the van anyway.
I use a Tapo TC85 outside, different ways that you can mount it, it has a strong magnetic mount or there is a threaded insert so that you can bolt it on, I don't drive with it magnetically secured.
Big advantage is that the battery lasts up to 300 days, easy to charge by USB, £55 also from Amazon
Picture quality is excellent on both items