Why a combined super-tanker is a damage-control risk

Would the Royal Fleet Auxiliary want a super-tanker carrying fuel, ammunition, containers, and vehicle space?

No. The mixed cargo creates serious fire-fighting and survivability problems that outweigh its apparent convenience.

An all-in-one support ship looks efficient until its damage-control problems are considered. Fuel, ammunition, vehicle, and container fires require different responses, so a hit on a combined ship risks turning one loss into a far larger disaster. Flooding a magazine or container space can protect the ship, but salt water used around fuel cargo may ruin the very supply the auxiliary is meant to deliver. The proposed vehicle deck and mixed terminals would also impose awkward structural, crane, roll-on/roll-off, and segregated fuel-handling requirements ashore.