I stay with Passport America. We haven't been able to use it this year, since my wife has been in bad shape, but last year's membership and what we'll get next year will mote than make up for it!
It's also interesting that the participating campgrounds are happy to accept your membership!
2005 Georgetown 342DS XL, Full Banks Package
2005 Liberty Renegade 4X Toad
1989 Wrangler Sahara Toad
1984 19.5' Beachcraft i/o 5.o liter, 4-bbl (and you thought your Moho sucked gas!)
D/W Carole and Maggie the Teacup Lab (Black Chihuahua)