If you are looking for a very lightweight fiberglass camping trailer, but not necessarily a classic teardrop trailer, Weis Craft Trailers in Colorado have several options. All their camping trailers can be towed with 4 or 6 cylinder vehicles and cost less than $10,000.
The Roughneck is more of a teardrop trailer shape with a bed that is placed on the floor, it's only 500 lbs. and includes an aluminum roof rack. It may be a little low for campers used to traditional teardrop shapes.
Weis Craft Trailers can be custom built or purchased directly from the company.