For when you get to the campsite, you're definitely going to want a cold one (whether that's beer, soda, water, whatever your pleasure) to satisfy you after a long, hot ride. Pack whatever frosty beverage you like in this nine-pack canvas cooler ($32.95). The liner is made of vinyl, not plastic, so it doesn't sweat all over your bike, saddlebag, etc., and helps to keep drinks colder longer.
You should probably pack a few pairs of chonies, making the Saddlemen Back Seat/Sissy Bar Bag a great choice for clothes and other essential items. If you're a solo rider, you can set it on the passenger seat and use it as a backrest, or if you're two-up, simply strap it on a luggage rack and go. The bag measures 19 inches tall by 14 inches wide and 12 inches deep, and is made of a rugged blend of fabric and leather-grained materials. The bag can also be utilized as a backpack when arriving at your destination. There are many pockets for easy access to whatever you're after and it comes with a rain cover with a security tether that protects the bag from the elements and also a mini-padlock with extra keys to prevent theft.
Lastly, a good book is always a nice companion when camping. Moto-Camp recommends Bob Woofter's Motorcycle Camping Made Easy, Second Edition, available for $19.95. In fact, you should probably give this book a look-see before the big trip and keep it with you throughout your travels. It's loaded with practical info including how to pack your bike efficiently as well as what to look for in gear and finding motorcycle-only campgrounds. The 275-pager is a must-have for motorcycle camping.
This Street Glide is loaded up with everything listed and more than a solo rider could envision for his or her camping trip. Everything was packed on in approximately 10 minutes; unloading and setting up camp took about 15. Moto-Camp also offers camping-inspired luggage racks ($199.99) that will fit many Harley-Davidsons that are meant for solo riders, and dock over the passenger seat/rear wheel so that you can pack more weight for the long haul.