So you’re headed on a business trip in a few days. Whether it’s a one-day car ride halfway across the state, or a three-day junket cross-country by plane, you’re probably giving some thought right now to getting your mobile office organized.What should you bring? What’s a must have versus a nice to have (after all, there’s only so much you can squeeze into your business briefcase)? What can’t you do without, and what can you leave behind?If you’re a mobile office veteran, chances are you’ve become quite good at knowing what to bring based on where you’re going and who you’re meeting with. Then again, reminders never hurt. Here’s my Top Ten list of “Mobile Office Musts”—those things you absolutely, positively, don’t want to be without:1. Your laptop or tablet. This item should be self-evident. Without a laptop or tablet, you’re not going to be very productive now, are you?