You have brand new vehicle and you are changing rim if you are converting to alloy rim so its ok otherwise do not change the tire size because it will effect on road grip performance and brake system also.
I will suggest you if you really need to install the camera so do not go for wireless it creates many issues and wired camera will give the best results. its only my opinion you can do what you want.
Toyota is a good vehicle and have durability. It looks bearing issue for me also and you can repair it if you like that vehicle so try to bring the price down and buy it otherwise automatic transmission also a good option.