L54-4352

Many years ago, my father used his motorhome as a traveling showroom for his work selling women's clothes. He has always had a coach, but has not traveled in years. I have recently moved in with him to help care for him and we plan to travel again. We have his tag with life member number L54-4352. But I cant figure how to register online or have him acknowledged as a life member. What benefits is he entitled to with this membership?