the oil tank drains very completely in a short amount of time, it is the crankcase which has an extended drain interval

 

I installed a Stahlbus drain valve on mine. I was concerned about it hanging down and being a potential failure if it hit something, but with safety cap on it does not hang lower than the crossmember or swaybar. I did it for the same reason you mention; to reduce the mess when the sump tank is drained. That's a hell of a column of oil, it drains so fast. The Stahlbus drain adapter only opens as you thread on their barbed hose fitting, the other end of the hose can go directly into your collection tank, don't even need a bucket or catch pan.

M20 thread:

Photo comparing its height to the stock drain plug. About a 5mm difference. The photo is taken close to level with the drain plug to show that the swaybar and crossmember are clearly lower:

 

Thanks for posting the picture. I often wondered why people thought the quick-drain connector hung so low.

 

I like it - I just ordered one!

 

I take it all back, looks good to me.