Yeah I was concerned about that kind of stability and I talked it over with my parents- so long as I don't intend to bring the stock tank inside for the winter they're fine with it. Mostly the portability concerns are for taking it with me whenever I move out, and I think I could pack up something like this- which I'm planning to get next time I go to Tractor Supply. I'm definitely gonna stack the paving stones around it like you guys suggested, I dunno how much they'll help with temperature regulation but they ought to make the tub look more like a fixture than, well, a tub standing all on its lonesome.