"the back of anything" - Translation from English to Arabic

Actually, you didn't stare at the back of anything. You were asleep before we got on the highway.
في الواقع، لم تحدّق بمؤخر أيّ شيء فلقد نمتَ قبل أن نبلغ الطريق السريع

Did you ever sit in the back of anything? Just the space shuttle, man.
هل جلست قطّ خلف أي شيء؟