That camper trailer is probably worth around $25k Aust.and goes up from there at a rough guess.
For those interested in where those scenes are they are from an area called the Telegraph Track in North Queensland and in particular a crossing at Gunshot Creek.
This crossing is insane and has caused more than a few 4wd's to finish their useful life there.
The trouble is that your way out in the boonies and if you destroy your 4wd it'll cost you somewhere around $5k to get it towed out to civilisation which is a few 100 klms away.
The 4wd in that promo is a Toyota Hilux with either a 3.0litre diesel or 4.0 litre petrol in it.
If you want to see what Gunshot can be like this should give you a rough idea on it's difficulty. There is a side track that gets you past this but quite a few tack the hard way for the pissing competition bragging rights.
This is just 1 video of what Gunshot can be like,