IF you are putting in gas shocks, don't buy the ones Beaver put in originally, buy for a much greater weight. Mine have to lift the whole bed, and are only strong enough to lift the empty bed platform. I have gone to the wooden strut system, as there is no room for the mattress and bedding except on the bed platform, so the original gas shocks are quite useless.
Ed has set a new standard for a wooden strut. Not one I considered, but now I may need to upgrade. Mine is simpler; a scrap of 2x4, jammed where it can't slip out.