Travel Trailer stabilizer

I have a Sundance 310QB TT and was wondering if anyone had any ideas of cheap or easy way to make it more stable. The biggest problem is at night when we're trying to go to sleep. My son is 11 years old and when he's on the bunk it shakes the whole trailer every time he moves. It took me some getting use to because in our old 25' TT it didn't do that. Any ideas on how to take some of the bounce out of it?

this is what I made and also put stabs infront of tires

I made these. Cheap, light weight, stakes nicely.
I found that you also have to take some weight on jacks to help with movement.

here's my post and link to pics. I put some blocking just in front of wheels and took one turn on jack to take wiggle from tires and suspention. also but wheels chocks in front and back of tires.

The farther down the stabs are the allow more movement (just like standing on toothpicks, compared to wide leg stance. more control for stability.

Hope this helps you as it has me.

http://www.northtrailtalk.com/showpost.php?p=9654&postcount=1

http://outdoors.webshots.com/album/572781145jUsGSk

thanks for the advise.