I had an Aliner for 1 year.  I purchased a used 2010 model in 2014 and sold it in 2015.  I am only 5'8" but I got a sore back from doing dishes on those short countertops.  Maybe the highwall model is better, not sure.  The door alignment was off, one window sometimes didn't want to close, and some other little stuff happened; put it all together and I didn't feel good about the brand.  
I looked at one of the Forest River models with cassette toilet/shower, but the drain system was stupid: the sink drained on one side, and the shower on the other side, so I'd have to move a tote around under the trailer for each drain depending on what I was doing. And the shower drain pipe went through a floor hole about 3 times too large... shoddy workmanship.
IMO it's hard to beat the regular travel trailer for the ability to pull over and just hop into the trailer for bathroom or snack or siesta.  A lightweight, aero, molded-fiberglass trailer like Scamp, Casita, Parkliner, etc will tow nearly as easily as a popup and is much more sturdy.  That's what I'm saving my pennies for.  I've towed that type of trailer (a 17' Burro) with a Highlander through the Rocky Mountains and it did well enough.  An Explorer Sport (turbo) or Jeep Grand Cherokee ecodiesel (turbo) would do even better, though, because the turbocharged engine doesn't lose horsepower in higher elevations (due to thinner air).