Check out www.fiberglassrv.com
for a wide range of vintage and current trailers
The Oliver trailers are very nice and a 17' Casita is a pretty nice rig.
Some of the R-pod trailers I've seen have seemed like a good deal too - the 17' R-Pod is a nice rig for around $12K
My sister has owned a bunch of trailers ranging from a 12' Serro Scotty to 23' Airstream to a 28' trailer (which is too big she says) and several others.
They plan to scale back down to the 20'-22' size range but might even wind up with something a little smaller.
I've had two 13' fiberglass trailers - nice size for small tow vehicles but I'd really like something in the 16'-17' range .