PRESENT PERFECT: Unwrapping Christmas and Chanukah gifts is lots of fun but wrapping all those presents can be a chore. Levi’s is aiming to redress that task with a mobile gift-wrapping service housed in a spiffy Airstream trailer that’s making the rounds of its flagship stores. Inside, trained wrappers will gussy up customer gifts free of charge, including any purchased Levi’s items plus one non-Levi’s item. The Levi’s Holiday Airstream will be parked outside the Levi’s store at 495 Broadway in New York from Dec. 6 to 8, following its stop in Los Angeles last week. It will travel later in the month to San Francisco, making stops at the Levi’s Plaza store on Dec. 18 and the Market Street store from Dec. 19 to 21.