It would be interesting to know what amp draw/wiring size is required for various newer cars/trucks that are towed. Considering navigation equipment etc that remains on, etc.
A potentially huge draw would be EPS which apparently the OP has since he mentioned wobble. Has anyone measured the amps used when towing especially with EPS running?
My Jeep has hydraulic steering with an electric motor running the pump. It appears to have 8 gauge wire to the motor which implies a lot of power is needed. I'd bet a donut the EPS also requires a lot of power. Just wondering how much is required for towing?
I'm beginning to suspect that the common 12 gauge charge lines just aren't enough for many newer cars.
In my experience aux brakes take very little power due to infrequent usage. But always on navigation, EPS, etc could have increased power usage.