Method and arrangement for providing a load carrier mountable on a carrying vehicle. The arrangement includes an elevating structure arranged between a base portion and a load supporting portion. The elevating structure is adapted to expand and contract between raised and lowered configurations. The elevating structure includes two substantially upright members, each of which is slidably moveable relative to the other for establishing the raised and lowered configurations. A fixing device is provided for releasably fixing the two sliding members one to the other. The fixing device includes a blocking member that is insertible in aligned receivers, one each of the aligned receivers being formed in each of the two sliding members for preventing expansion and contraction of the elevating structure. The fixing device further includes a take-up arrangement that is configured to press one of the two upright members against the other thereby forming a releasable friction fit therebetween.