Please help me between AU and BA Falcon for reliable outback ute

Hello.

First time posted and long time reader here so hello from Queensland! :)

Recently my uncle lost his long battle with cancer. He was a courier for my grandfather in western Queensland and the Northern Territory. My grandfather has asked if I could step up and take over my uncle's job, deferring my studies for a little while. I've said I'd be happy to.

My grandfather is basically going to let me pick an available vehicle from their station to use for delivering them medicine and groceries once a week, while also performing deliveries around the district for other nearby stations as my uncle did. I'll be compensated for my time (paid a weekly wage).

I'll have to do a lot of remote driving along the Donohue Hwy/Plenty Hwy between Alice Springs in the Northern Territory and Boulia in Western Queensland. The 'road' surface is everything between corrugations, deep sand and large gravel so high vehicle durability is very desirable.

Now I believe there's an earlier petrol AWD Territory available for me to drive but I think for delivery work I'll be better off picking one of the utes. I know from memory there's a couple of AU3 tray backs and a BA or BF RTV tray back available for me to drive - probably a BA.

Originally I thought the RTV would be the pick with it's increased ride height etc. until I read in my research that some circles consider the AU falcons to be the more reliable albeit ugly duckling option.

I know the utes all have the same service history and around the same kilometers on them. My uncle used to do the vehicle servicing and did his mechanic apprenticeship with Ford so I believe everything is maintained as per the books.

I think one of the AU3 utes has a couple of inches suspension lift installed. All utes run the same BFG AT tyres (so does the Territory). All vehicles have long range fuel tanks, bull bars, water tanks and 2 spare tyres.

Would anybody care to chime in on any durability/reliability considerations between the vehicles available to me?

Thank You for your time.