285/75R16's are illegal to fit to a patrol yes, But they are not really that noticeable in the size difference. So if you fdo want to fit them have a look at insurance and the like, or if you don't care just enjoy. You can only legally atm go 15mm bigger or samller in rolling diameter than what the vehicle came with standard. Also correct me if I am wrong, this rule is set to change soon, with the laws being relaxed slightly.