G'day Tim,
I'd only consider a Nissan Patrol or a Toyota Landcruiser.
What ever you decide, it should be DIESEL.
I did a lot of homework before I got my Patrol. I considered:
Parts, servicing, mechanics knowledge, local repairs and dealership locations.
I'd suggest you give Telstra a ring and find out how they kit their 4by's out. I"ve got a 'pre loved' ex Telstra, Nissan Patrol 4.2 TDi. It came with all the fruit, as it was set up for remote travelling for a single operator. It is very OSH friendly. An excellent selling point.
It came with winch, spotties (IPF900), 2 spare tyres, dual batteries, long range tanks (1 x 90 and 1 x 80lt), fresh water tank, rear steps, 8lt hot.cold Handiwash, Reece towball hitch/tongue - so you can insert a proper, rear, rated recovery point - and not snatch from the towball (big NO, NO).
You need rated front and rear recovery points, a decent recovery kit and a set or two of Maxtrax - all of which can be transferred from vehicle to vehicle. Make sure everything is 'rated". With my front recovery points, I have 2 - one on each side - so that when I am recovered, or recover somebody, the weight is evenly distributed.
One big factor in your vehicle selection consideration will be resale value. From what I've seen, Toyotas and Nissans hold their value pretty good.
Mention the words OSH, Duty of Care, diesel and resale value in your report, and I think you're onto a winner. lol
Please, ring Telstra, Police in other states in OZ, and a few other big companies, even mining companies, and speak to the Vehicle Fleet Manager, and see how they set their work vehicles up. If you use a bit from each, give me a call and I'll seriously consider setting mine up that way, too. lol.
I've also got a HF Codan AR NGT radio, CB and a Telstra mobile phone with an external aerial.
All the best.
Take care out there.
Rossco