Louise, I should have added in my first post that during my "fiberglass RV owning career" I've had a Scamp 13' (a '78 that I had in 1980-'81), and since March of 04 I've had a
UHaul 13', a
Trillium 4500 (very briefly), a '91
Love Bug II, an '87
Burro 17' widebody, and now an '02 Scamp 16' custom deluxe. I'm heading to Spokane in a couple of weeks to pick up an '00 Scamp 19' custom deluxe fifth wheel. I've not owned a Casita, but I've had the opportunity to look at a couple of them up-close and personal.
I didn't plan on buying any of them, but the
UHaul. Then the next one came along... nearby, and with a feature or two I wanted that the last didn't have. This parade of various manufacturer's offerings has given me a real opportunity to compare and contrast the differences in workmanship, materials, and construction.
My conclusion is that you can't go wrong with any of them by brand. The care and maintenance any individual used trailer has had over its life is significantly more important than who built it.
Regarding the sealed floor vs. open floor issue, I used to be concerned about the open floors in the Scamp and
Love Bug as the
UHaul,
Trillium, and
Burro all had fully-glassed in floors. That was until Donna Shubel, another member here bought their
Burro 17'. They've ended up doing a frame-off (as have several other members) because the wood inside the glass rotted because water got trapped inside the 'sandwich' and couldn't get out. So, as long as they're sealed properly, a glassed floor will literally last forever, but as soon as there's an opening in the glass for water to get into, the floor is doomed because it can never dry out. The open floored trailers seldom (I don't think I've ever heard a complaint, as a matter of fact) rot from underneat. Almost all floor rot is the result of
leaks from inside the trailer pooling on top of the floor and never drying out fully. Those
leaks typically come from
windows, air conditioner, or roof vent
leaks.
Anyway, hopefully that'll give you a little more hard info on which to base your selection. If you're buying new, buy the best value for your money. If you're buying used, buy what you can find that you like!
Roger