A straight adjustable sway bar? Interesting. What brand did you purchase?
About our TV. I mounted it to an angle-cut board, then using three 1/4" lag bolts, bolted the assembly from behind to the cabinet. I later concluded I did not like the TV facing so straight forward, even when considering the angle-cut board. I increased the "down angle" by adding 5 washers (the kind you use with carriage bolts when building a deck) per lag bolt which tipped it more forward nicely. Those washers also made a gap in back which increased air flow behind the TV. The down-angle made it better for the passenger seat viewer when travelling, and also for the 3rd seat which was oiginally a barrel chair.
I had also added a wide homemade metal bracket to anchor the bottom of the TV. That stabilized the TV perfectly. It also helped when mounting the TV to the cabinet as there is a resting place while working-in the lag bolts.
During our last long trip, our TV developed more than the usual amount of rattling. About 3 weeks ago, I dismounted it and brought it in the house. I removed the back panel to discover the top-dead-center screw tab had broken off the plastic back cover. I used a lot of 2-part epoxy and hope that won't happen again.
With the back of the TV removed, I went through every place where metal rattled or vibrated. There is a lot of sheet metal in our TV, from framing to RF shielding. After tightening all screws, I tapped with my finger-tip. When I heard a vibration sound, I added adhesive backed rubber pads and such. In the end, the TV no longer rattles at all. I tested the TV in the house when finished and all works great, but I have not yet road-tested it. If I did harm in the end and the TV fails in some way, then it will be time for a new thinner, light weight TV.
Our 2007 model, widescreen 26" TV is the first of it's kind and is quite heavy compared to new TVs. TVs today seem much more appropriate for the application. The new thin edge-lit LED TVs use much less power than our TV which is a huge factor with a whole house inverter and no hook-ups. Considering the power hog that our TV is, I almost wished it would break so I could buy a new low power edge lit LED TV.