What is your average length of overnight travel for audit? Also how is this compared to consulting? What would you say is the percentage of time you are at 'out of town' clients?
Audit: There a lot of factors that play a role in determining this. Some people never travel out of state, some people travel 5-6 months a year. Some people have 1-2 clients that involve traveling 2-3 weeks a year. Your position also plays a role in determining how much you travel.
So if you're a staff associate, and you are on a client with a facility in Nebraska, you'd have to be with the team the whole time. If you're a manager and above, you'll go to Nebraska for 2-3 days tops. You could ask to get put on jobs that require travel, and if you have personal commitments at home (baby,etc.), you can ask to get put on clients where you don't have to travel much. Your request will not always be heeded, but the firms will try.
Consulting: Buy a carry-on, toiletries kit, etc. etc. because you will be traveling. The average consultant will travel for six months a year.