All that procedure is pretty standard, including the tie down..... you may find the most damage if any is the forks under the car but not often, but still i use a tilt tray and back it in and pull the car onto it...... = zero damage and i now cover the cars on the bottom in that sharksin plastic the spraypainters use = no oil etc on the bottom car.....here is anther tip try not to place anything on your upholstery those containers reach absurd temps coming across and even a cardboard box can burn a mark into it....all this is has happened to me so you learn pretty quick.....cheers