HSVs have short range, & are relatively fragile. They can't do what the UK is currently using its ro-ros for, i.e. shipping supplies & heavy equipment to troops in distant theatres. An HSV is strictly intra-theatre transport.
BTW, I don't know why Agra suggested a ro-ro would have to sit in port for days. I've been on plenty, & I've never known one to take more than an hour or so to offload. If your load includes trailers without vehicles to tow them, it takes longer, but still hours, not days. You can carry your own tractor units to tow them off. All that the ship needs is a quay, & parking space for the cargo.
Offloading offshore would take longer, of course, but if you have a sheltered anchorage, & the right equipment (which a militarised ro-ro should have aboard), you can offload from the ramp directly onto lighters, without needing to winch anything.
Whether you want a ro-ro or an LSD, such as the Bay-class, depends on want you want it for. An LSD can function as a ro-ro, but is far more expensive.
An HSV isn't a substitute for a ro-ro cargo ship. It has different capabilities, suited for a different role.
BTW, I don't know why Agra suggested a ro-ro would have to sit in port for days. I've been on plenty, & I've never known one to take more than an hour or so to offload. If your load includes trailers without vehicles to tow them, it takes longer, but still hours, not days. You can carry your own tractor units to tow them off. All that the ship needs is a quay, & parking space for the cargo.
Offloading offshore would take longer, of course, but if you have a sheltered anchorage, & the right equipment (which a militarised ro-ro should have aboard), you can offload from the ramp directly onto lighters, without needing to winch anything.
Whether you want a ro-ro or an LSD, such as the Bay-class, depends on want you want it for. An LSD can function as a ro-ro, but is far more expensive.
An HSV isn't a substitute for a ro-ro cargo ship. It has different capabilities, suited for a different role.
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