I would have thought that low observability and RADAR stealth would be a must for a lumbering beast like this. Even if it has a tailwind it would be lucky to make 150kts ground speed whilst carrying critical items like F35 engines or an AEW capabilty - it doesn't really make military sense, does it?
Whilst we're on the subject of loads, I think a Herc can carry 20t and the C17 closer to 50t. So why they are pushing this as such an amazing cargo-lift capability, I have no idea - plus the fixed wing aircraft could have made the trip 4 times over in the time it would take a HAV to amke a single journey!
LJ