I have a 2018 Big Horn Treveler 39MB. Have had three years now and maybe 8-10k miles on it. I can tell you, I don’t think it is made for full timing. I have yet to open the door and not find saw dust and at least one screw on the floor from unknown places, The insulation is inadequate, single pane windows And poor quality In the assembly. Sheet metal or wood screws on fiber board and veneer, All of which back out constantly and can’t be tightened, adheasive backed fixtures letting go due to heat, and hardware that constantly losses during transit. It is very maintenance Intensive.
Although it has 2 A/C units, the cooling is barely able to keep up (due to poor insulation) and heating is chaotic depending on which area of the trailer your in. So, it is great for a mild summer trip but I think cold temperatures or extreme heat would be uncomfortable full timing. The appliances are good and have performed well. The structure is solid and seems to ok on tires etc. roof vents are on the cheap side and factory sealants are minimal and need redoing, I would steer more to the grand design models. Higher price point but better quality I think.
