Bed Gas Struts

Hi looking for an answer about bed gas struts to fit my designer. I have bought some rover 25 gas struts - I have had a look at some of the different ways of fitting them. I have noticed that the struts have been quoted at 170mm and 330mm from the pivot point. My question is this has any one fitted them differently? I am thinking of fixing them 275mm and 275mm from the pivot point. The thinking behind this is that at full extension it would stretch to 550mm ( max extension 600mm) so still under compression . When beds are open or closed the struts would be compressed to 390mm. Is this too much pressure or this ok? Any help would help me as I do not want to start drilling holes and then find to be in the wrong place regards Gary

Hi and welcoe to the forum

Have a look at this

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The first page gives some very useful info from John

Thanks for information all help gratefully recieved. Not sure whether the 170 and 380 is taken from the hinge or the edge of the trailer/bed regards gary