This is going to be my first go at "motorcycle camping". It's either going to suck or be the start of something fun.
It can be a lot of fun if:
1). You don't bring too much. If you're bringing a trailer, you're bringing too much (unless you're riding 2-up).
2). You are prepared for rain.
Seriously consider bringing a hammock instead of a tent. It will cut way back on the bulk you are bringing. You do need trees, so if you are going to a treeless area, tent would be better.
I think it is a bit of an art - seeing how minimal you can go. You need less than you might think.
One area to cut back on is clothes. I'd recommend the following:
Jeans: 2 pair, kevlar. NO MORE!
Shorts: 2 pair. One heavy weight. One light weight - the kind with zip-on legs.
Jacket: 1, fleece zip-up style, lightweight
Long-Sleeve Shirts: 2 (one safari style with pockets and such, one not, but thick style)
Socks: 3 pair.
Underwear: 3 pair
Boots: 1 pair, motorcycle
Sandles: 1 pair (for camp site, general walking around)
Jeans: 1 pair, fleece/flannel lined (if it may be cold where you go)
Boots: 1 pair, hiking
Swim trunks: 1 pair
Sweatshirt: 1 (if you think it may be cold where you go)
Sweatpants: 1 (good for around camp, and riding if it may be cold)
That's all you need for clothes. You can stop every 3 day and find a laundrymat. If you want to add 2 more pair of underwear and socks, you can extend it to 5 days.