In village resource (farm) production gear. Look up hyperfarming. 

Thanks to you all !

It's a pity that there is no equipment for all resources in one...

Hyperfarm meas that you chose any 1 rss and do your best to make all the buildings in your town of same rss type building. So there is no need of all in 1 rss equipments. And you can also mix 2 rss types but the outcome would be less. Also with any rss on rss building side area you can have silver hyperfarm on other side. Personally i have 2 barracks 3 infirmeries and rest of manors in all my accounts. Even i go with food and iron in 1 account wood and iron but silver in both of them. Tho only thing that matters most is your economic knowledge and hero skill points. Rest gear can give you particular rss boost but in longer run you would have sh equipments for silver and whole set of it to max out your rss production of silver.