You are probably restricted by the state you reside. Certainly RACQ club membership requires a Qld residential address. Having said that, RACWA offer a non motoring membership to interstate visitors that gets things like WA park passes at half price. Whatever you get, go for top roadside cover, don't confuse roadside breakdown service with accident insurance and check the dimensions of your rig including weight, are covered.

I think what Dabbler is advising about is that you need to check with NRMA or whoever you sign up with, if they will tow/ load your caravan/car if you have a breakdown of the caravan, like a friend dropped the axle but it was not an accident, so he had to pay to get it trucked. Also if your van is too heavy they will not tow it if overweight. 

 

RACWA have some sort of reciprocal deal with most of the other states similar motoring organisations. Had to use it once in Wentworth NSW and was attended to by the local NMRA people. Really good service. Had top level membership cover.

Officially they all have fixed limits but sometimes in areas serviced by contractors, there is flexibility. I certainly wouldn't rely on that though. They all use contractors, even where I live on the Gold Coast and it's our 6th largest city. Because the reciprocal agreements only cover basic roadside of the state where you need service, RACQ advice members to contact them first. They then do all the necessary behind the scenes stuff. In theory. Keep shopping so you're informed and hopefully it's never needed. I'll throw another one at you, have you thought about ambulance and emergency medical transport ? It's a another curly topic.