I have SH4 1.4, so no U-boat addon missions. If I ever upgrade to 1.5 what I would do is use the mission editor to create resupply bases with a U-boat set as "docked" in various locations. AFAIK there's no way to set an actual refueling ship of any kind, but in the Pacific campaign I fake it by making resupply bases near islands with a docked sub tender.
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