Agree with SimchaSabre, you can't have too many tools.
Lynx Levelers are a wonderful product and can be used as an alternative to 2x6's. They are light weight, stackable, and easy to store. 2 packs of them will be plenty and they are available at Wal Mart and Camping World.
Always carry a step ladder. They come in handy.
Extra water hose for cleaning up and rinsing sewer hoses, etc. You don't want to use the same hose for drinking water that you use for the stinky slinky, lol.
Bug spray, outdoor tablecloth, grill, broom and dustpan, RV toilet paper, RV sewer treatment (either the drop ins or liquid, we prefer the liquid), cleaner, mop, cooler for the Coca Colas or whatever other beverages you may enjoy. Heck, you'll think of something else you need just about every time you go out.
As others have said, learn to be patient and enjoy your RV. They aren't like Honda cars, you will have to work on them from time to time. That can be half the fun if you don't let it get to you. This is a fantastic source of advice and assistance when you have a problem you need help troubleshooting.
Congrats on your new TT!!
Mike in Tennessee
Former 2 time FR owner
2007 Crossroads Cruiser 30QB Fifth Wheel
2008 F-250 Lariat 4x4 6.4 Powerstroke
Firestone Ride-Rites w/cab control