I too made my own for about $54 at Home Depot. I used 3 ea 4" galvinized angle iron that has holes/slots drilled the length of the angle iron and 6 each 4" strap/standard hinges. I cut 1 piece in half and used that between the bottom of the rt rear jack and the frame going forward, and the other 2 pieces of angle iron going from bottom pad of rear jack to top of jack mount on the other side going accross the back of the trl. I used the hindges to attach the angle iron to the jacks and frame at both ends of both bars, then 1/2" bolts and nuts to bolt the bars together 2 for each bar. They work great to stop the shimmy shake of the trl, that and the wheel locks.
2012 Winnebago "Journey To Insanity" 40U
2008 Dakota Sport 4x4
2004 Subaru Baja - DW's
2006 Honda Shadow Aero - TOAD for now.