sway pulling toad?????

If this is a Ford E series, make sure your front end has at least +5 degrees of caster before you throw money at the problem.

Is your tow bar with in the Blue ox specs for being level.
You will get some wind movement. The rig is a big box and cross winds can be difficult.
The toad having tow bar not close to level can cause sway.

I didn't start towing until I had a few tens of thousands of miles without towing. I have not found that the towed vehicle has an impact on cross wind handling, though it does matter dealing with 15 mph to 30 mph curves taken at too high a speed.

You need to get used to the winds, sort out what is your problem from over-reacting, what are the handling problems of the RV itself, before you add the towed vehicle as a complication. Starting out with the toad is a lot like beginning your flying lessons in a glider tug.