I am not a travel nurse, but I do happen to know quite a bit about the nut-n-bolts of the tax laws; take my advice w/ a grain of salt and consult with your tax professional.
Typically, ANY and ALL unreimbursed expenses incurred while producing income are deductible. Uniforms, travel expenses and mileage, parking, tolls, fares, meals, lodging, dues, agency fees, etc. are all deductible against your income. There is a mileage limit (50 miles, I think) from your residence before meals and lodging are deductible.
Are you a W2 employee or are you given a 1099-MISC at the end of the year? This is important as if you are a W2 employee, you must itemize deductions to take advantage of any of this. As a 1099-MISC contractor, all expenses reduce the total income. Subtle difference to be sure, but a difference nonetheless.