Not an easy decision
I wonder if the questioner finally decided whether to go with an Airstream or a Lance. I have owned 5 Airstreams over the past decade or so and am about to give up on the brand. I have an unusual program in that I spend a lot of time on gravel roads and always dry camp. The Airstream is just not up to the task. It leaks way too much dust, the ground clearance is marginal and the interior construction gradually falls apart. Also the plumbing system has many points of failure and is extremely difficult to service when it does fail.
Whether any American made travel trailer is truly up to the task is an open question. I suspect that only Australian travel trailers are built to withstand the rigors of my style of travel. There is always the EarthRoamer, but it is far to large for me.
It's a pity that Airstream doesn't build a version of the Sport, say, that had better ground clearance, better insulation and a simpler more durable build out.