I don't think that the AZ chapter has nearly as high amount of members as other chapters and that's the main thing that leads to no activity on the board.
In terms of membership, is there a lack of members in Northern AZ? I live in Williams and am a new member, and would be happy to do what I could to recruit people from up here. It seems that in the summertime, any sort of auto enthusiast group dies off because the majority are from the deserts and the temperatures make things difficult to do. Up here, we don't have that issue quite as bad so I see people out with their XJ's quite frequently around Flagstaff/Williams/Prescott. If someone has some "pimp cards" (it's what another group I belong to called them) and can send some up to me, I'd be happy to try to pass them out or leave them on windshields.