Not all JW are cremated, but I think they don't have the fear some NON dubs do about cremation hurting the body, since they think Jehovah will remember them and resurrect them. So many may cremate just as one of their 'living life simpler and more budget minded' ideal...
they to like to call the service a Memorial Service, not a funeral..
and while I have usually seen (if there is a body) the visitation at a funeral home where as the talk itself is at the hall.. therefore no need for pallbearers,as the funeral home would coordinate things if the body is to be buried.