Pulled to the left when being passed by Big Rigs

1L243 wrote:
I'm towing 10,000 bumper pull Toy Hauler. I'm under my Gross weight in both the truck and Toy Hauler.. My TW is 1440 pounds including the hitch.

My trailer sits level when being towed. But everytime I'm passed by a big rig or a big box truck I get sucked over.

Is there anything I can do to deal with this or is it just then nature of the beast!