I have a new 2015 3124 KD Trailmanor that I am still getting to know. There are pluses and minuses based on what it is attempting to do:
Pluses:
1. Low weight.
2. Low drag by folding down.
3. Hard sided safety
4. No tent fabric to dry out when compared to popups
5. Excellent towing, no sway at all (I have a Blue Ox Swaypro) and much better gas mileage than a typical travel trailer. In my case, I get between 15-16.5 MPG on a 2005 Avalanche that is not really designed for towing (small V-8, 2 WD, 3.42 rear end) although I have the tow package.
6. Much more room and niceties than a standard popup. For instance, I have a king bed, a very large full kitchen, a very nice dinette that can be converted to a full size bed, and I upgraded to a compressor refrigerator that will actually get cold in the hot summer weather.
7. I can also confirm the excellent customer service.
Minuses:
1. Have to open and close it (takes me 2 minutes to get it open and about the same to close it) plus about 5 minutes to get the inside ready.
2. Bathroom in the current models cannot have a black water tank due to the inability to get an RVIA certified venting solution (should have it on the RISE model they are working on though). That issue comes from the fact that the bathroom folds up when towing so a pipe would be a real challenge. TM gives you the option to have either a recirculating toilet that can dump like a standard black water tank or a cassette toilet (I have this).
3. Although I have a very nice refrigerator, it is much smaller as it cannot be taller than counter height.
The best place to learn all about TMs is to go to their forum. As you can see, I also come here as both have very nice and informative topics. I hope I am not breaking any rules by posting this link:
http://www.trailmanorowners.com/forum/index.php
One last thing. They have just relocated their manufacturing to Nebraska from Tennessee. They are planning to leave an East Coast service center which I really appreciate. I am near Virginia Beach.