Not familiar with K&M at all, but do yourself a favor. If their membership prices are not listed on their web site, RUN! They will high pressure you and "probably" for the money they want for membership only, you can do a LOT of independent camping for that.
Trust the reviews you've read.
One comment on the BBB web site ... so true:
"Besides, when you do the math there really isn't the cost savings they try to convince you of."
And another reviewer:
And proceeded to tell us how he could "upgrade" us to a level where we could get what we really needed (what we were told we would get for $335/a year) ... for an $7,995 fee. The good news? Our $2,000 discount could be applied against that, so we ONLY owed $5,995. And our annual fee went down to the $250 range and the restrictions were removed. Doing the math in our heads, we were acutely aware we would save a lot of money by going the KOA and/or state campground route. And they were nicer ...
Yes, I agree with the reviews, for THAT kind of money, you can do a LOT of camping at State, other private, and National Parks and be able to go anywhere in the country!
BBB consumer comments, click here.