You will pay a premium for molded fiberglass, and they tend to be smaller than the traditional built trailers. What you get is durability and a lot less depreciation.
Hybrid trailers tend to give you light weight
and max sleeping capacity for their size.
Depending where you plan to live/travel, 4 seasons could be a requirement, which will drive up cost and weight
As far as a home, we have a 980 sq ft home, downsized from a 3,200 sq ft house. One unusual feature in our house is the public rooms are large, while the bedroom (just one bedroom), bath and kitchen are very small. Its an unusual floorplan (1934 build), gives public rooms the same size as our old house.
Not surprising, this is a FG RV forum, so you might want to look elsewhere for recommendations that are not fiberglass.