Let me warn you that this is a bit of a personal opinion, but my first thought here was also one of the fiberglass egg trailers (Scamp, Casita, even the Lil Snoozy). In the case of the Scamp and the Casita the design has not changed much in many years with just some updates for the times like the addition of flat panel tv's a few years ago. They also tend to hold their value better than newer entry level RV's, it is not uncommon to find a 10-15 year old fiberglass egg trailer selling for 60-70% of new cost, where a traditional "lite" entry level trailer may be worth 20-30% of original cost at the same age.
On that lite topic, in my experience (I have never owned one, but have shopped for them), the vast majority of trailers with the word "lite" in the name is code for built as flimsy as possible so it can be pulled down the road by what would otherwise be considered an under sized tow vehicle. Just stepping into many "lite" trailer models I can feel the floor flex under foot compared to stepping into their non "lite" equal size brethren.