I'll be honest with you.
We had a keystone sprinter 27rlss. It said it had a cold weather insulation package (it was the 10 year anniversary model, 2013 I think). While the tanks never froze while winter camping, the heater ran, alot.
As for durability, we lived in it for six months after owning it for a year. It held up, but things started going wrong. A couple of the light fixtures failed (not the bulbs). We pulled the LR slide in one day and water poured onto our dinette (it hadn't rained in two days). The black tank flush system failed and shot water all over the bathroom. We had a few other minor problems, but all of it happened in the span of three weeks. So we got rid of it. We figured we spent 260 or so nights in the tt, about the same as someone would spend in five years of 'normal' usage. For a vacation and weekend tt, it would be good for about that long, then I would consider getting rid of it.
I don't think it will take a beating like an Outdoors RV tt, though I have no experience with them. Outdoors RV was our first choice, but we couldn't find one within 1000 miles of the east coast. We think our Jayco (previous tt) was better built than our Sprinter.
