Well for us, it is the same as all the previous comments, local, state and federal regulations, and of course my own opinion and practices. But really, we leave ours on the concrete we have on the side of the house which also has our electric, water and sewer connections. We use it once per month, for about a week, and sometimes five or so weeks at a time. longest it sets on the pad without moving is about 6 weeks. So that is me, you be you and we all do our thing. honestly, i am not sure of any damage you will do. but if I were parking it for a couple years or even six months, I would probably level it with mobile home screw jacks and take the tires/wheels off, release some air and stack up on their side. good Luck & Be Save ! ! !