It would be nice if the game would disable the possibility of building tribes right on the junk piles. I have seen tribes build their camp on junk piles effectively destroying part of it and also gaining an enourmous advantage over other tribes. Having your territory on a junk pile allows them to attack players scavenging without the possibility to be attacked back.

The junk piles should be something tribes fight over but its simply not fighting anymore when you cannot attack them.