Hi Lars, my 3 kids on the other end of the trailer make it wiggle a lot for me too (they probably say the same thing about us), and I've been looking into installing something like this:
http://norcoind.com/bal/products/con.../lockarm.shtml
or this:
http://www.campingworld.com/shopping...6-struts/35782
Is this similar to what you are thinking of doing? I'd like to install one of these over the winter if I can...