New item is on the way to USA.

L14-30P to TT-30R*2

If you have a generator have 4 prong locking L14-30R outlet.

Need to support AC power to (2) TT-30 outlet for your RV 30AMP Plugs.

Parkworld #60646 can do it. 

http://www.parkworld.us/60646-p440.html