........Ive got it now....
Use the bogan or Drifter hoon cars that get nabbed, and put them side by side (nice angled bonnet,windscreens) in da water, for 2 stage ramp - almighty peak creating 'fast & furious" tubes

.........PURRRfect.... just make sure the boot is closed

P.s when the swell changes direction - we can just roll them da other way !!