you'll never know ahead of time where the exact line is between "not overbuilt" and "underbuilt
I believe trailers have been on the road for at least a few years. so it's pretty easy to see what has worked and what hasn't work you need to learn from the history many frames are now built that mine is bigger than yours. it on Facebook so it must be true
look at some of the tent trailers probably the least supported by the box that sets on top of it. Am sure Tent trailers have been around for at least 10 years