I've heard the same thing before about Snowbird/Snowriver, though you don't see a lot of them.
There are lots of truck campers around here. You usually see them heading off into the mountains with either a fishing boat or dirt bike/quads behind.
Within a 60 mile drive of my house are the manufacturing plants of Bigfoot, Citation, Northern Lite, Okanagan and Snowriver/Snowbird. They all seem well built to me, especially when compared to my budget 5th wheel.
Bigfoot seem to be the most popular. I've been in a couple of Northern Lites that really impressed me but they don't make a slide.