The problem with AAA is they are not one outfit providing service throughout the US and Canada. They are a grouping of regional clubs who are supposed to provide reciprocity. However, if one club does not offer RV Plus coverage, and some don't, you will not get that level of service from another club leaving you on your own. 
AAA is outstanding for automobile coverage but not as well equipped to handle RV's, especially big ones. AAA has started to morph into an insurance  and travel store with less emphasis on road service.