Your are correct when you say that's expensive, but when you spend over 40k for a tt what's a couple hundred more.The link i showed every one was only to get an idea what i did to stop the wobble. Hears a less expensive one, and i'm sure if you did a goggle search you could find one cheaper yet.
The 2011 Rockwood Windjammer 3065w That my wife and i have, already had electric stabilizers front and rear from the factory, so i stayed with what works the easyiest, and looks like it came from the factoty that way.
Also, I instauled the electric stabilizer my self and saved a few $$$$.
8 bolts some wire and a little know how took me about 2 hrs total.
I mounted the switch were the steps tuck up into and tapped the wire into the existing 12v wire under the tt.
This sure beats crawling around in the dirt, sand, stones and mud etc. when it's raining.