So have you ever been in Eriador and come across a ruined tower, you think this is so awesome and search through every floor to see if their is any relics of the long forgotten realm of Arnor, just to find 1 stone chest at the top with some minor loot. Then you find another 1 with pretty much the same stuff with the 1 chest at the top. You'd think in a ruin that there would be more stuff than just a single chest at the top. So here is my suggestion.
Make the arnorian towers more diverse were the orcs too lazy to pillage the very top floor while everything else is pillaged like nothing their ever existed. I think that maybe their should be armour stand with nothing or maybe a chestplate or helmet, also chests with rotten food (would give poison 60% of the time or something like that) sometimes coins and armour in other chests and many other items.
This being said with the ruined towers getting a buff I think that they should spawn more rarely. At this point in time you see one every few hundred blocks you move it seems.
Also maybe more ruined variations, there already are the destroyed houses which I don't think need a change. But maybe ruined arnorian forts. These forts would be just like other forts. Maybe a new Arnorian gate would be added. This fort would be made out of Arnorian bricks as well as the other variants. The walls would have a wood platform made of rotten wood or other types of wood. Their would be bricks and wood missing all over the place. The gate would be somewhat destroyed as if it had been battered down. The inside might have chests with some rotten food. Their may be some armour. Their would also be a crafting table maybe a furnace and such. In the middle their would be a destroyed fountain with some water flowing out onto the ground.
Inside the fountain there is a small chance that there is a hidden entrance probably a trap door that would hold some rangers of the north with a captain. Another idea is that some of these forts would actually be defended by rangers of the north who have rebuilt some of the destruction. (mostly the wood though). just like other fortresses their would be a captain. This is just supposed to represent some of the rangers who have resettled a destroyed fort. Their might even be a small village based around this fortress.
This is my suggestion hoped you liked it. Just to give some more flavour to Eriador and rangers of the north. I know that Mevans is great at work on rebuilding the world of middle earth for 1.15 but just an idea for after he is back to where he is for 1.7.10