Sway bar or no sway bar

I have had them on previous trailers. We do not have one on our T@B and I do not intend to install one. I would put my money somewhere else.

Do not use sway bars if you have surge brakes.  They defeat the function of the brakes.

My dealer includes it on all the T@Bs he sells. Not sure if it's a CYA move on his part or not (nothing wrong with that, btw). I've had the same question and drove with and without when I had my 2006 Rav4 with factory tow pkg (V6) and the same with my new TV, my 2015 GMC Canyon pickup. In the Rav, I noticed no difference; however, I was not traveling with the T@B in high wind areas that had gusts more than 30ish mph. I kept the sway bar in the Rav just in case. I have yet to run the sway bar with the extra-long hitch on the new pickup and pulling the T@B, but the option is there if necessary. 

When I asked my sister about her 2004 Ford Explorer Sportrac with tow pkg, she had no issues without using the bar while towing her Outback (slightly higher axel height). When her BF towed the Outback with his Jeep (a CJ - type), they noticed handling issues and realized they might need to use the sway bar with that TV. She said with his Tow Vehicle (TV), handling improved dramatically using the bar, but it wasn't a critical issue (as in, they couldn't proceed with the trip because of trailer sway if they didn't have the sway bar or the option to put it back on).  

I think it's a combination of the profile, wheelbase, and type of TV you are using in addition to the T@B being a very light camper. My T@B is prone to bouncing a bit and it's been mentioned in other threads that not only are campers (normal land yachts and light weight ones) not meant to be towed at excess highway speeds, the tires put on campers (including T@Bs) are not rated for speeds much over 55-60 mph.

Keeping your speed low with a TV that was not set up in the factory to tow (no factory tow package) and has a fuel efficient transmission and engine is the key. It can still safely tow the T@B if the driver is cautious and takes things slow. The sway bar may aid in handling, but it is not necessary. When it comes to high crosswinds, no one can circumvent nature. Big rigs and large campers are known to get blown over (go do a YouTube search). Smart campers/drivers adjust their driving to the weather, elevation and winds, even if it means cancelling travel plans for the day. 

Some people just put the sway bar on for no more than peace of mind, and there's nothing wrong with that either. Just don't forget to take it OFF when you start to back it up. That sucker will bend nicely in half when you turn sharp (not even a full jackknife). Expensive piece of metal to replace. 

I hope some of this helps!