I'm a member also. Like most have stated, it's more aimed towards the WWII collectors, but whats interesting is that most of the members also have M-series stuff in thier collections. The publications are fairly good, although Supply Line seams to be the same old crap every time. As a whole they do do good in fighting to keep the rights of MV owners from states who try and pass laws restricting the privite use of MVs. As for the Board of Directors and all their problems, it's a bunch of waving and I try and stay away from that aspect of it.
If you are trying to save some insurance money, you might just try joining your local affiliate, West Sound Military Vehicle Preservation Club. It should be enough for the insurance company and would keep you out of the mess at the national level.
Dave
1967 Kaiser Jeep M715 weapons carrier:http://www.davidallenracing.com/M715.htm
1967 Kaiser Jeep M35a2 2.5 ton cargo truck: http://www.davidallenracing.com/M35A2.htm
Delta Team Decals: http://www.i2k.com/~schwarzd/