2 people, ocean recliner, 4wd towing 5m trailer(includes drawbar) $1482 return on Spirit
5200km @ 12l/100km @ $1.30litre = $810 plus a bit more say around $1000 (depends on type vehicle and fuel consumption)
$300 accommodation at event
accommodation while traveling. Depends on camping or room. $600
$3500 for 2 people, not including the thousands of dollars of food and refreshments

. Obviously could be done a bit cheaper......or dearer depending on taste. A lot of driving! Think I'd fly and hire a car

(limited gear though).
Ditch the trailer and load the car up cuts the cost down a bit.