Can't see the Japanese getting into this market -- not enough world wide demand for the MHs. Also, they are good at copying production but, would still have to build in the US to start with and the start up costs vs the return on investment would not warrant. They could not build outside of the US as the freight to get the product here would make the cost too prohibitive to buy. Also, if you note, the key parts in the MH (drive train, etc) are not foreign made so they would have to purchase from American manufacturers for the key parts).
Just my thoughts on the "foreign invasion" for MHs.
Dave and Karen -- '02 Ultimate Advantage 36 C, 350 HP Cummins, Allison 3060 Tranny, 2013 Ford Edge, InvisiBrake