I remember when I was a young boy my father worked for AM General on the hummer project. It was a long time ago and I'm not sure what year but I'm wondering if the V22 airframe dimesions were defined before or after the humvee entered service? This may explain why it isn't big enough to swallow a hummer.
As for the armed escort situation I read an article about the V22 some years ago and when the subject came up a high ranking Marine said something to the effect of "we already have that...it is called a harrier". I guess the escort roll requires a speed of 1.5 times that of the aircraft to be escorted as per this same article and that makes a 400 mph plus machine, squarely in harrier territory.
I don't know if I buy the whole thing at all. I think we may have been better off just designing a faster helicopter. This hybrid monster does some great things...but is it really the things we need?
Max