Hi lift jacks are dangerous if not treated with respect, as Mega mentioned you'll need a base plate for sand work. Always leave a hi-lift with the handle in the up position.
Modern 4x4 are not really made with a hi-lift in mind having being coil sprung you'll be lifting it for ages to get a wheel off the ground, but there are gizmo's to lift via the wheel,.
exhaust jacks on the other hand are perfect for sand work, practise how it works and where to place it, Only down side is storage being a little bulky, but great piece of recovery gear.
treated well should last for years.
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