Many FG people have moved up from tenting. We are one of them. As such we tend to be minimalists. It seems unusual to me that people want a lightweight, mega trailer. That is sort of like looking for a place in the country near a shopping mall.
We love our 13' and wouldn't think of having anything else. It is like it isn't there when driving, and if I can u-turn the car, the trailer has no effect. Y-turns are not so easy, however. LOL
Also, I have more than once dropped the jaws of 30-40 foot tailer owners when I pull the trailer to the car when hitching up. Admittedly, I no longer have to do that because our new TV has a back-up camera.
But anything you have to do with the trailer, from cleaning, inside and out, to moving, etc. 13' makes it so much less work. We have heard of the trailer disease, "Two footitis" where people think, "If only I had two more feet of trailer."
Good luck in whatever you end up doing.
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Whether you think you can or think you can't, you're right.