Well, I can easily get 2 enclosures. Yes, I have read that about the heat rock, which is why I built in my own thermostat, i.e. made it so I can adjust the heat rock cooler than snake heat rocks; it is not hot enough to cause her any damage even if she fell asleep on it, which she never does. I can understand where they may have evolved to be somewhat less sensitive to warmth on their bellies, since in the wild they get the majority of their heat for metabolism from sunlight. But to say they don't, or can't, sense heat on their underside or aren't very sensiive to heat there, would mean they have no ventral thermal sensory receptors, and that just doesn't make sense, especially when lizards also use rocks and other sun-heated surfaces as a secondary source for heat regulation, and get a real advantage from this, particularly on cloudy afternoons, for example, or early evenings, when the rocks are still warm, but the air is cool. Being able to thermoregulate from this secondary heat source would add to their success and survival, thus would be an advantageous adaptation.
I wonder if dragons who have been burned by rocks in the past had this happen because they wanted to take advantage of the heat, as instinct told them to so, but the rocks were too hot to begin with, and also too consistently hot, unlike rocks in the wild, where rocks previously warmed by a sun (that has recently set) cool down as the lizard warms up/stays warm. Thus, when the dragons got burned, people misinterpreted what was happening regarding their heat senses and behavior? Or maybe the rocks simply just don't get quite that warm, typically, in the desert? I don't know if this is true, but I do know that dragons not sensing heat on their tummies would be counter to their evolution as reptiles.
I have watched her carefully, (I guess it's hard not to when my career is based on animal behavior research), and I have noticed she is sufficiently sensitive to the heat of the rock to respond to it appropriately. She will lay on it for a short while - it is midly warm, above room temp, but not near the temp it was when I bought it before I could adjust it - and after she eats she enjoys the heat the most on her belly, and less on her feet, because after about 2 minutes she will raise all four feet in the air, while keeping her belly on the rock for a couple (5) minutes longer. Then she will move off the rock. I have watched her do this repeatedly. I pick her up, to see how warm she is, and her temperature - although I admit I haven't actually measured it - never feels hotter than after she has been basking under the lamp, or in natural sunlight. I then lowered the temp even more - (it felt ~room temp to me) wondering of it was still too warm because of this foot lifting behavior, and then she pretty much quit laying on it altogether, until I raised it again, a bit. I also cover it with a light dusting of substrate - it still sticks up, and is apparent as a rock (not hidden or buried), but she doesn't come in contact only with rock surface, 3/4 is buffered by substrate.
Now you have me curious, though - I'm going to begin measuring temps in different parts of her enclosure.
I guess no one wants to answer my question about breeders?
Also, I have read a lot about sand, and substrates, and it is a controversial subject. As long as it doesn't have silica in it, some breeders who have used it for many years claim their dragons have never had a problem with it, ever. Probably one of those things that will never be entirely agreed upon. I'm not going to argue about it. Anyway, her travel cage has sand. Her enclosure has (small particle) Sani-chips.
Renee