The hose on the stock valve cover breather is 1/2". Some connect a breather to the crankcase outlet under the carb. I bought a Bando with a 1/2" hose connected front and the rear valve covers. Thought there might be something to this so I made a tank with 2 outlets mounting above engine level rear of the LR tire and connected hoses from both valve covers. It was a lot of trouble and in the end I don't think it made a bit of difference.
If you do add a hose to the rear valve cover, add a baffle to keep oil from splashing directly into the hose. You can drill and tap the side of the valve cover and use a 1/4" NPT hose barb then weld in a baffle. You could also use small screws to mount a baffle.