I had a 36' Class A, sold it, bought a house, and a 25' travel trailer. It was fine for short trips. Very lightweight (3995 lbs), but no slides. There are only two of us, and we have a 20# mutt. If we spent an extended period of time in it, the walls would slowly creep in. The bathroom area was the biggest impact of tight spaces.
We are in the process of selling our TT to a niece, and we purchased a 34' Class A now that we are approaching retirement.
If we ever downsized again, I would look closely at a Rockwood 27' TT with a slide. My friend has one (since 2004), and it has far more usable room in it compared to our 25' model. Wouldn't think 2' makes much of a difference, but it certainly can!
In the meantime, we are enjoying the glorious amount of room we have once again.
Have fun shopping!