Mitsubishi is interested mostly in the commonly used extensions like .com, .us, .info, .biz, .net. Sedo has 54 mitsubishi-related domains for sale. Of course, if Mitsu really wants that name, they will let you know.
I think unless you do some cyber-squatting and make some money trying to syphon off traffic, you will certainly not be looking at a lifetime of debt, in my humble opinion.