The HiLo design is fairly resistant to sway, so you possibly don't need sway control, however, some Weight Distributing Hitches (WDHs) incorporate sway control in their basic design without any add-ons. Mine, an Equl-I-Zer WDH does this and it is very easy to use.
In my opinion, unless you are towing that 22 ft trailer with at least an F250 or 2500 SuperDuty class tow vehicle, you DO need a WDH. If you don't use one, a standard hitch is normally limited to 500# of tongue weight, and I think your trailer puts a heavier load than that on the rear of your tow vehicle. All that weight is going on the rear axle, probably overloading it and the wheels and tires, while lifting the front of your tow vehicle, making front traction on the tires very poor. This badly effects steering and forces the rear brakes on your tow vehicle to carry the braking duty, which they are not designed to do.
And, since you have tandem axles on your trailer, your trailer is being towed in a nose-down configuration, which puts most of the trailer weight on its front axle, wheels, and tires, possibly overloading them too.
So, I recommend you DO get a WDH and since anti-sway is such an inexpensive add on, if not included, you get that too for the additional stability it provides. If you ever encounter trailer sway, you may lose total control of everything very quickly and can end up in a fatal crash. Additionally, an overloaded tire is more likely to blowout, which can result in severe damage to the trailer or loss of control too.
Note: trailer sway is not just annoying, it can suddenly escalate to a point where it enters a positive feedback loop that is totally uncontrollable. If this happens you WILL crash.
- Jack
