Hello from over east. I am no expert in WA rules (no expert full stop!) but I don’t think there is much you can do if the ute is parked on their lot, you can’t choose your neighbours and they can largely do whatever they want within reason (eyesore or otherwise). Consider some ‘neighbours be gone’ type fast growth trees to block the view or something like that?
The noise amenity issues may be addressable through environmental protection type enforcement as unsociable noise may be considered excessive. Maybe explore that avenue, but remember you will need to be neighbours and so it is best to try and work out an amicable solution rather than go the legal route. There may be no turning back if you go that way and you will have to deal with the consequences.
Sorry I can’t think of anything helpful.