is it a full size bronco?? if it is it should fit,sitting on the tail gate.
the BII didnt have a lift off top. Anyway, my buddy had a K5 blazer and his recon fit with plenty of extra space and it had the seat in it just folded forward which took up at least a foot. he had a Bronco before that and it seemed to have more room in it. he didnt haul a quad in it though.