ATF: Landmark - stack washer dryer install

I have a 2014 Grand Canyon and had my stack washer & dryer installed in the new unit by the dealer. They used some brackets to secure the unit to the floor. It does seem to be fairly secure. My concern is that it is top heavy and should I have additional mounting up toward the top on the dryer? Concerned that it is to heavy and may have a lot of movement when traveling. I have thought about adding a brace to the back of the dryer and attaching to the closet wall. My only concern with that is during the spin cycle the washer does vibrate a fair amount. Any suggestions? How do you mount the stacks when installed at the factory.

Thanks for your assistance.

Ted

I have a factory installed washer and dryer in my 2011 Grand Canyon. There is a "L" bracket on the side of the dryer attached to the stile between the closet and the washer/dryer cabinet. I will try to remember and take a picture later to day and post.

Brian