My expectation would be that pumping up the flat-jack is very difficult and heavy with a big weight vehicle on it?

Answer: no, even children of 6 or 7 years old can pump up a heavy 7500 kgs camper, because the flat-jack only needs 1.2 bar (17 psi) of pressure since the flat-jack has a big surface which lifts the camper easily at little pressure. With a simple bike pump you pump up a normale bike’s tyre at 4 to 5 bar pressure, so pumping up a flat-jack with only 1.2 bar of pressure is far more light and easy as pumping up a bike’s tyre. Ideal.

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