Too much pressure, too much power and too much speed. Let me explain, let the tyres down to 12 psi or even 8 psi and let those tyres bulge and create a bigger footprint. Then keep off the power as that only causes the tyres to spin and when that happens you only go down and bog. Thirdly keep the speed down and allow the tyres to roll on top of the sand and not dig in. How do I know this, I live in Western Australia where around half the state is sand including most of the farmland so you soon got to learn how to drive in sand. The only time that momentum can be of a benefit is when driving up a sandhill like Big Red. It is very dangerous the way people drive through there when the right approach as above will get you there a lot easier. Try driving Callcup Hill in the South West, a climb of 250 metres in 2.5 kms.
Why waste time, trash the vehicles and the track when we have the technology (bits of timber) to fix the problem. I suppose people make money from other people's problems.
Queenslanders All Getting Super Bogged at Ngkala Rocks, Fraser Island