Best way to connect to Less than 30 amps?

[RKassl]

We will be traveling through Canada on our way to Alaska in a couple of weeks and have noticed that it is common to have less than 30 amps sometimes 15 to amps at campsites. My question is what is the BEST/Safest way to connect the Monty to the pedestal? I have a heavy duty 30 amp shoreline that I could use an adapter on to attach, or should I use a pigtail adapter right away and then use a heavy duty outdoor extension cord to the connection on the pedestal? I just don't know if the heavy duty 30 amp line would build up too much heat or would the 20 amp extension cord? Or am I just splitting hairs at this point?

Thanks!