Welcome to FiberglassRV, Isharra!
Lots to be learned here, and since you already have some previous RV experience, you're a step ahead.
Molded fiberglass is a great way to go, and options range from tiny, basic 13'ers to full-featured 28'ers. What they all have in common are seamless exterior shells that all-but-eliminate seam leaks
, the bane of conventional trailers. Some have a rounded egg-shaped shell for better aerodynamics (at some cost to interior space); others have a more conventional squared-off profile. Some have a fiberglass interior; others have wood cabinetry. A few have dry baths, many have wet baths, while the smallest may have no bath at all. Lots of choices, new and vintage, but they're still very rare in comparison to conventional RVs. We just got back from a trip to a nearby lake park- 150 sites all full for spring break, and we were the only molded fiberglass trailer.
If you plan to shop the used market, be prepared for sticker shock: molded fiberglass trailers have much higher resale values than most conventionally constructed trailers, and most sell quickly at or near the asking prices. If you buy new, be prepared for a wait: for the most part they are sold factory-direct to the customer's specifications, and this is the busy season. I don't know about the others, but Scamp
is now taking orders for fall
A helpful resource as you mull over your choices is the thread Trailer Weights in the Real World
(post #297 links to a handy spreadsheet). Manufacturers and sellers often quote unrealistic dry weights, which do not include options, fluids, or any of your stuff. Real weights can be many hundreds of pounds more.
Best wishes on your "egg-hunt"!