Sandied

I bought a house in Ozark Missouri, just south of Springfield and have been told by the inground simming pool dealers that you can not put a fiberglass pool in Missouri because the ground has so much rock and the rock is shifting all the time. Can this be true or do they just want me to buy a liner pool. One guy says he will sell me a pool that is acrylic and when I asked him to explain he said the sides are fiberglass with acrylic over them and then a cement bottom. If you are never to empty a pool after a few years how do you paint the cement bottom when it needs it? I have called dealers of Leisure pool in St Louis and they won't return my calls. With sales down you would think they would want my business. Can someone please explain to me what kind of inground pool I can have. Thanks