Flyoz Probably 500 grams -1KG its not as sturdy or stable as a proper tripod though so say an SLR camera would probably rip over in a wind or if the ground vibrated? My phone is quite a heavy tradesman type 364grams and it works great no issue . A small handycam would be fine or say my Cannon sx50 but i would be careful with it . The center extending post can be lowered between the 3 legs foor extra stability weight carrying strength.

Flyoz Most likely 24 hr if wind is constant which it wont be Slim Potato Head on You tube did a video of using similar on his A frame camper van

Flyoz Dont buy the Micro usb port is very flimsy soon you wont beable to charge the phone or connect to a PC

Flyoz Yes if you want it to activate when you put your car in reverse. other wise connect red wire to any 12V power wire for continuous camera (I dont know if this effects lifespan of camera being on always)/