I have never owned an Aliner, but have owned two Chalet's. The original trailer. They are excellent trailers and I think the Aliner has improved some things over the Chalet. It does have a Dexter Torflex axle, or at least did have the last time I looked at them.
But understand their off road trailer is only cosmetically improved, bigger tires, more drop on the axle, and diamond plate on the front of the trailer, sometimes powder coated or linexed.
The frame, I think is box tubing, at least it was on the Chalet.
You can make them quite capable, by just adding to the frame and converting to a multi axis coupler.
They are quite strong and durable, the Aliner may have an aluminum upper frame, not sure.
I tow my trailer where most will not, and I think you could do quite well with one. I almost converted mine to soley off road, but instead sold it to Wikid and he is in the process of making it more trail worthy.
Of all the popups, the Chalet was the best built I thought, and I think the Aliner is its equal. Have fun my friend, as there is nothing faster in set up and so many lite years ahead of the canvas crap they continue to sell. Truly a very well designed trailer, years ahead of its time. And it has tons of room inside. I loved mine, just too small for great danes, we had 4 that went with us.
Would buy one in a heart beat, no question,.