I was just wondering if it is possible to alter tank designs, shapes so that they integrate into the machine in a more compact fashion. The large double tanks on a ztr seem to add a lot of width and bulk to the mower. I imagine some of the main problems would be cost and lack of interchangeability, but would there be a safety issue? I like the idea of propane, just thinking about ways to downsize the machines and still have about the same fuel capacity. Thoughts anyone?