Ron,
A couple of recent Arizona Court of Appeals opinions have held that amendments to CC&R's and/or bylaws cannot impose additional obligations on the owners. If there was no requirement to have homeowner's insurance when you purchased your property the HOA cannot now demand it.
In
Dreamland Villa v. Raimey the issue was that the HOA amended their CC&R's to require owners to join a community club and pay dues for it. The Court held that the HOA could not do that.
In
Wilson v. Playa de Serrano the court held that an HOA cannot amend the CC&R's by amending the bylaws. At issue was the HOA amended the bylaws in an attempt to make a condo an age-restricted community.
While neither of these cases are directly on point, they would suggest that the HOA cannot impose a burden that was not stated in the CC&R's.
(Click on the case names to see the original opinions.)