In June 2015, to assess her future deployment, "Isle of Lewis" undertook a tour of major terminals for berthing trials, with varied results. She called at Lochmaddy, Castlebay, Oban, Craignure, Brodick, Ardrossan, Troon, Campbeltown, and Tarbert between 4 and 9 June. No immediate decision was announced. Major work would be required to offset her stern ramp to starboard instead of to port, for her to operate on routes including Mull and Arran. Such adjustments would not prevent her returning to Stornoway for relief work, as both Stornoway and Ullapool harbours now have full-width linkspans.