Rear tailgate height when opened

Hi All. Does anyone know how high the rear tailgate is when it's fully opened? And also, when the tailgate is opening, how far out of the specifications for length does the tailgate protude out whilst it's opening?

My garage is on the snug side for length and am wanting to know if the tailgate will hit the garage door when its opening ( The measurements I have done doesn't leave much room lengthwise ), and if the tailgate will hit the roof of the garage when its opened.

Thanks all