I went over there in 1973 on my 650 cc Triumph sidecar outfit loaded with camping gear, no problem, apart from stalled VW type 2 camper vans stuck on the steepest corners.
You found this difficult in a Land Rover...? Well I did it in my measly Ford Fiesta 1.0L Titanium with no 4WD option, and apart from stalling once because of someone coming downhill (driver error, lifted the clutch a bit to high, too soon) the car handled the two passes with ease. As for the Roman Road, a quick look on an OS Map will show that the modern one isn't exactly on the same alignment, apparently they did know better lol!! Great video by the way - but invest in a dashcam, less shaky results.
