I found the Jay Feather to be about the nicest lightweight trailer that we looked at. They just seemed a bit more solid than the competition when we bought ours. We also looked at Surveyors and they were lighter for the same sized trailer so something like that may be the way to go. Aerolites were also very light, but I seemed to hear about a lot of delamination and frame issues when I was researching. The Grey Wolf trailers were also fairly light if I remember but not quite "ultra" lightweight.
2012 Jay Flight 29QBH
2003 Dodge Ram 2500 Cummins H.O. 48RE
Equalizer 4-pt sway control hitch
Prodigy P2 brake controller
2006 Jayfeather 29Y (past Jayco :))