When I shop at Camping World they use my phone number to establish my discount. The one time I called Good Sam for roadside assistance I don't believe they asked for my ID#, I don't carry my card, so they probably just used my name or phone number to verify service membership. I don't like to carry a bunch of cards around. The markets and the department stores and the hardware box stores all seem to find my membership number from phone or name data. So if it just the same to GS, I really don't need a membership card, I just need to be a member.
JMHO
Happy Trails.