On both this Montana and our prior Montana we put the crank-down scissor jacks. They help only a little on the side-to-side motion but totally stop the up and down bouncing. Totally. I crank them down only to snug and do them after setting all other stabilizers. Some folks prefer to crank the scissors down hard and before the rear stabilizers. Use whichever method works better for you.
In our case I put the scissor jacks behind the rear wheels although in front of the wheels works just as well. Use whichever location is easier to access. By the way, the self-tapping screws that came with the jacks work just fine. These jacks were on our 2003 Montana and were moved to our 2007 Montana and have never loosened at all.
If we had the level-ease system of the new Montanas I wouldn't bother adding stabilizers. Those systems are very stable, from what I've seen.
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