I recently purchased a twin leveller and on every occasion I have used have been asked by people for your contact information. Good idea putting spare leaflets in the bag!! having had a caravan slip off an alko jack its so much easier to use. To protect against sharp stones I simply purchased a length of carpet runner protector. lightweight and rolls up for easy storage I now wish to add an additional single leveller to make it a combo pack. How do i go about this.