I have a 5th wheel that I really like, a Mountaineer, but I wouldn't consider full-time living in it. And it is a good deal 'heavier' construction than so-called 'Lite' trailers.
Last Thanksgiving, I set it in our driveway for the grand-kids to sleep in. It was cold, and two 15 watt heaters couldn't keep it at a residential temperature. More like maybe low to mid-60's. Just not heavy enough for winter use. I think it got down to the low 40's at the time.
Even Texas will have sub-freezing weather in most winters. That would mean heavy use of the furnace, and keeping a trailer in propane is an expensive proposition.
I'm with the others: if you plan to full-time, you need a lot more trailer than any 'Lite' will offer.