RRF's vehicles and equipment, was seen as the minimum standard, although a larger vessel like Union Rotorua, almost able to deploy the entire RRF, was preferred. Union Rotorua was the first ship considered for acquisition, with inspection beginning in November 1991, but after the New Zealand Defence Force began to look at other vessels in mid-1992, Union Rotorua was dropped from contention. In researching New Zealand defence acquisitions, Peter Greener claims he can find no clear reason for Union Rotorua to be dropped, but identifies the size of the ship, which would have been by far the largest vessel ever operated by the RNZN, and the gas-turbine propulsion system, which was due for overhaul, as factors. Shipbroking company Rugg and Co was contracted in July 1992 to identify civilian ships that met the RNZN's criteria and were available to purchase second-hand; the company returned a list of 33 ships of 20 classes, which the Defence Force culled to 21 ships of 9 classes, then again to 4 classes. In October 1992, around the same time as the second revision or Rugg and Co's list, shipyards in Spain, Korea, and Poland were asked about the cost of new-build vessels. By January 1993, a Mercandian 2-in-1 class vessel was identified as the preferred type; although there was a loss of capability compared to a purpose-built vessel, this was seen as an acceptable tradeoff as the RNZN would have great difficulty affording a new ship, particularly after acquiring the Anzac class frigates. An independent review by British company BMT Defence Services indicated that conversion of such a vessel for military service was feasible, but warned that the ramp size and vehicle deck height were smaller than the RNZN had specified, and that motion in heavy conditions, particularly with the later-planned modification to carry helicopters, was a concern. Approval was sought from Cabinet in April 1993 to purchase a ship, although the decision to buy a new-build or second-hand vessel was unresolved. The Australian government offered to lease or sell the Royal Australian Navy's heavy lift ship, , to the New Zealanders in late 1993; although the offer was responded to favourably, it was rejected because of the lower cargo capacity and higher personnel requirement compared to the Mercandian design, despite Tobruks capability for beach landings. The decision to acquire a second-hand Mercandian 2-in-1 class ship was made in July 1994. Rugg and Co