I had a Shadow Cruiser 185 BFS (I think the letters are correct) and it was just too small. Everything worked everytime I used it. However, the tires lasted only about 2K miles. Daughter and son-in-law still have it, and everything still works. It had walls that were only 1" thick but it was small enough that the air and heat worked well. My Surveyor Select SV-264 has 2" walls and it uses just about the same amount of heating/cooling time as the smaller Shadow Cruiser. You might check the wall thickness for that as it seems to make a difference in comfort. Have fun!
J & D in Lovely Weatherford, TX
2016 Jayco White Hawk 28DSBH TT
2014 Ram 2500 Crew Cab 4X4 6.7L Cummins