Our new Montana is quite stable with the jacks down however I sometimes raise it a bit more once its done with auto level to take more weight off the tires. This is where some of the bounce comes from. We do use x chocks between the wheels but I have never found anything under the front jacks makes a difference. As far as completely removing any movement good luck because unless its on blocks its not going to happen. I have had ours off the ground and you could still tell when the washing machine went into spin cycle.