1 point - how many C130 frames do the USMC have? Looks like they are the guys using the above kit. I suspect they don't 'role on / role off' (sic) this capability - the wiring looms alone must add a significant payload to the frame as well as the time in depth to fit. I guess if needed to, they could revert to cargo use but given how many frames they have - would they need to?
UK RAF on the other hand - could we tie up frames getting the conversion done and then manage their use among the cargo/pax taskings? I would seriously doubt it. If we had the spare capacity in the lifter fleet, I'd be guessing that is being swiftly allocated to avoid looking like 'surplus' come SDSR. More likely, there is no spare capacity for the palleted option.