F/B setup and dealing with bodyroll

with f/b setups normally if they lines are just T'd off the valve, and your taking a corner does the air pressure transfer from one side to the other? I'm thinking so, and can you counter act this with a couple of check valves on the bags?

Also if say on the front you T it off do both lines off the T have to be the same length??? I mean if one is longer than the other, will the vehicle lift level or one side up farther?