I don't have a TD4 but I gather that the power and torque of the engine is similar to a D4 2.7TDV6 (about 200kg heavier than a D5 TD4), which I had before. I've had that on sand in high range and was fine, in really soft sand or dunes I've always put my D4 in low range so can't comment. But if all you wanted to do is to take it onto a beach, I don't see you'd have any issues.
Ron
2016 D4 TDV6 Corris Grey
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2018 D5 TD6 SE Silicon Silver - gone
2011 D4 TDV6 2.7 Indus Silver - gone
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