Sway bars are designed to reduce coach roll like taking a corner or a sudden gust of winds hits the side of the MH. Track bars reduce unwanted yaw, or tail wag. Typically occurs when a semi passes the MH and it fells like your suddenly getting pushed out of you lane and you have do do a steering correction.
If you do not have a rear track bar, adding one will most likely make an improvement I overall handling.
I believe most modern coachs have front and rear sway bars, they just might not be stout enough.
Paul, Kathy, and Tux a 4 month Mini Schnauzer
2014 Tiffin Phaeton 42 LH, 2013 Honda CRV
"When the time comes to look back, make sure you'll like what you see"