I have looked around and only found a couple 400a split 200a srevice entrance rated transfer switches, the Briggs and Stratton and Milbank. The Briggs and Stratton says it must be used with their generators, and the Milbank looks too busy inside from the factory. I am limited on space so installing 2 200a switches is out. The generator will be a used 50kw diesel Kholer. Kholer makes 400a ser ats with double lugs on the load side, would that be the way to go, or am I getting into 240.21?