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You can make two trips and load the loot into the bus. In my opinion, Revan placed the bus there with exactly that in mind. Otherwise, a group of armed thugs carrying something from the mausoleum on their backs doesn't look very good. But then, just in case, you'll need to leave a guard in the bus. There should be enough time for this, if everything goes according to plan and Perdel's troops get distracted by the slave traders.