File an extension for your income tax if you won't be back in time. I bring along books, tools and hobby supplies. If I bring a Wal Mart atlas it's so I can avoid them, although the maps are handy. Bring a Woodalls or some such campground directory. There is always something to fix or upgrade on the trailer or truck. I bring supplies for washing and waxing them also. Some campgrounds will let you wash your vehicles, some won't. Laptop computer. Satellite receiver. Crockpot for cooking those pot luck items. You'll think of more...usually after you leave them at home..It gets easier after you've gone out a few years..Have a good time..
B.O.