If it is a collapsible RV you are looking for the TM is definitely the high end. We almost bought an A-Liner with dormers but it was just to small.
Our camping needs were simple, a bed you could exit without crawling over your spouse, a full bathroom, pantry and closet space. In exchange for an extra 5 mpg, less wind bumps and ease of storage, we opted for the ability to stop on the road for lunch and camp overnight without unhitching or setting up.
This opened up a world of used TTs, and the savings can buy a lot of gas.
Still, like the Airstream TTs, a Trial Manor is a premium trailer that one can be proud to own. Especially if it fills your specific camping needs.
To the OPs point, we could not find a Hi-Lo anywhere at the time we were looking.