Why hasn't Webber built a QD hose for their grill?

I beleive they have.. however it is not marketed by them and it is a special grill as well.

The problem is this: Different trailers, Different low pressure QD's.

This is why I recommend the Extend-a-stay/extend-a-flow type devices. Universal QD (Looks like the top of a disposable bottle) works with most everything Webber makes save for the humungous jobs with like a million BTU's (ok, I'm exgaratting a bit here)