30A Male to two 15A Female Y Adapter - where is it...?

I have just the 30->15 amp $5 converter. I always worry about leaving it in the camp outlet. But I think (if I understand correctly) you want a 30amp that splits to more than 1 - 15 amp so here is one for $22 Conntek 1.5-Feet 30-Amp Tri-Outlet Cord, 30-Amp Locking L5-30P Plug to Tri-Female (3*5-15R)