I've just discovered I don't understand newtons. The struts on our drop down bed are 2400n, when we've looked for replacements it says 1700n for a Hymer. We bought the van second hand so don't know if 2400n are the originals or have been changed before. The bed has been difficult to lift since we first got it so we are wondering if it has the wrong struts on. Does a greater pressure make it easier to lift or more difficult? Has anyone any idea what struts should be on a Hymer B524 please?