Self engineered with a little help from some other posts I have seen on another rv site. $55 in parts and an hr of labor.
I put a pair of the BAL brand Locking Arm Stabilizers on my 20MRB last week. I'm definitely not as talented as Bldrman. If you aren't either, this is what I posted in this thread:
http://www.jaycoowners.com/forums/f30/tired-of-the-rock-n-roll-27860.html
Murff