Absolutely, testing has shown that due to the high leverage caused by carrying too many bicycles, towbars can fail due to the improper use of bicycle carriers.
Towbars are not made to carry the type of loads created by overloaded carriers. The further away the carrier is from the rear of your vehicle and the more bicycles you carry, the higher the forces. The effect is caused leverage.
In Europe special testing programs have been created to test both the carrier system and the towbar to ensure it does not cause failure of your towbar.
We subscribe to these standards and only supply carrier systems that pass these tests.