For the essentials with full-hookups, I've prepared a basic list in the order of need upon your arrival at the campground site:
(note: before departing, sanitize the water system and check all wheel lugs)
A. Parking the Trailer.
1. Wood blocks for placing under the tires to level the trailer side-to-side (if necessary);
2. Leveler gauge(s) for determining if trailer is level;
3. Wheel chocks for preventing the trailer from moving (put in place before disconnecting from tow vehicle);
4. Wood blocks for the trailer tongue jack (e.g., a couple of 2x8s);
5. Wood blocks for placing under the (4) four leveling jacks;
Comment: for nos. (1) and (5), go to a big box hardware store and have them cut a couple of 2x4s (10ft or 12ft in length) into one (1) ft blocks.
B. Water Hook-Up
6. Water Pressure Regulator for attaching directly to park/site water faucet (this protects the water lines in your trailer);
7. Two (2) white water hoses (plan on two hoses b/c sometimes the water faucet is "conveniently" placed some distance from your city water inlet connection);
8. A 90-degree angle water elbow for attaching to your trailer city water inlet connection (this provides a more stable connection and reduces stress on the inlet connection);
9. A water filter (a basic (blue) one can be found at most walmarts) for inserting in-line between the white water hose and the 90-degree angle water elbow;
10. A package of two (2) nylon hot water drain plugs as a preventive measure (see, for example, http://tweetys.com/drainplug918572ca...FckWMgodO1QADQ
) -- never use a metal drain plug;
Comment: before turning on the water, open a cold and hot water faucet farthest from city water inlet connection to allow the air inside the water lines to escape)
C. Electrical Hook-Up
11. A 30amp-120V adapter (see pic at bottom) used in conjunction with circuit tester (see, for example, http://www.jaycoowners.com/forums/sh...ad.php?t=19483
, post #4) to test the electrical circuit at the pedestal;
Comment: before making any connections to the electrical pedestal, turn OFF all circuit breakers on the pedestal. Then connect the 30amp-120V adapter to the 30amp connection on the pedestal; turn ON the 30 amp circuit breaker. Next, insert the circuit tester into the 30amp-120V adapter and ensure that there are no electrical errors. If all is good, turn OFF the 30-amp circuit breaker, remove the adapter and circuit tester, and then attach your 30amp electrical cord to pedestal; finally, turn ON the circuit breaker. In general, state parks (such as where you are going) are usually wired correctly so you shouldn't find any errors, but it is good practice to always check before plugging-in. If errors found, move to a different site. In the future, you might want to consider adding an electrical management system (EMS), but I consider the EMS beyond the basic essentials; same consideration for a digital voltmeter.
12. Spare automotive blade-type fuses (take a peek at your power panel and see what type of fuses you need -- e.g., 5, 10, 15, and 20amp fuses);
D. Trailer Usage
13. Two (2) small carpets for reducing dirt/wear-n-tear on trailer flooring. Place one carpet on ground underneath trailer steps; place the other on flooring adjacent to door opening;
14. RV toilet paper;
15. Spare light bulbs;
16. Torque wrench (eg. 120 ft-lbs) for ensuring that the lugs are properly tightened. I recommend this as an "essential," but many do not. It is good practice (if not highly recommended) to check all wheel lugs before departing.
17. A clear drain adapter for attaching to the drain tube (for the grey and black water tanks) on the trailer, where the sewer/drain hose is attached to the clear drain adapter (this will allow you to know whether the tanks are clean upon draining); see, for instance, http://www.dyersonline.com/rv-plumbi...-adapters.html
Comment: even though you'll have full hook-ups, do NOT leave the black tank drain valve pulled out (ie, open) while camping. Doing so will allow solid items to become affixed to the side/bottom of the black holding tank, and in turn, create problems. Keep the black tank valve closed during camping and only open when departing.
18. A drain/sewer hose;
19. Disposable gloves for use during the dump station drill or on-site sewer;
20. A garden hose for rinsing the drain/sewer hose and related components (also, depending upon your trailer, the hose is handy for attaching to an integrated black water tank flushing connection); and
21. Black water holding tank treatment (I've had good success with Oxy-Kem but there are others; see http://www.walmart.com/ip/Oxy-Kem-Ho...-12pk/16647988
Enjoy your first camping trip! If you need help when at your site, don't be afraid to ask other campers for assistance.