Relocation 4WD

Hi Bruce, I have done about 10-12 of these over the years, taking everything from the smaller Hilux PopTops to six berth motorhomes across Australia.
Sometimes I organise another relocation vehicle at the first drop off to travel to another place several thousand kilometres away.
The process is very easy and quick to organise but I would recommend you still pay for the insurance. if you dont take the insurance and get a stone chip on the windscreen for instance, that can cost a lot of money. Better paying for it for peace of mind I believe from experience and not stress so much when people cannot keep their car/caravan/third trailer on the bitumen.
They do have a set period to get the vehicle there, usually works out about 600kms a day when travelling the area you mention so when travelling the West Coast, 600kms is very easy if you are use to long distance driving so if you do more it gives you time elsewhere.
One problem with the vehicles is lack of long range fuel tanks so you will have to stop frequently, 300-350kms, to refuel when punching into the wind over this way which takes up time.
You can pay for a couple of days to allow more time for looking around along the way which may help.
From my experience and likes, the bigger the better for comfort in a Captains chair, the shower,cooking facilities and speed/ease of getting going in the morning. Fuel costs are not that different as the bigger vehicles are European diesels being more fuel efficient for their size than some of the other manufactures carrying a poptop punching into a headwind.
You will enjoy your trip and from my experience, organise another. They are not a proper holiday as time is limited, but if you like open spaces like me, its a great destress and gives you ideas on coming back to an area you have passed through. Highly recommended. Safe travels.