We are also shopping for a new rig that is more suited for couples as are kids are grown and too busy with college and/or work. We have walked through a few of the Sport Trek Touring TTs at various RV shows and they are pretty nice overall, but there are aspects of their construction and their extremely low CCC that keeps them off our final shortlist.
You mentioned downsizing and it is lighter, but at roughly 38' and now being towed behind your truck, it will be as long if not a longer towing combo then your previous rig. From their website it states a UVW of 8700# with a GVWR of 9995#, dryweight is always understated from the factory and with so little margin left, actual CCC could fall below 1K# with batteries and propane.
