Lease purchase breakdown problem

I have the 2018 t680 kenworth, only had 80k miles on it when I got in. Drives smooth but it's been down twice now for the same problem and kenworth can't seem to fix the issue. Breakdown Insurance is 100 bucks a day and not enough to cover my payment.

There is a horrible vibration that overtakes the entire tractor when I brake into a ramp or slow for a curve with a load of at least 35k in the trailer. At first, a crack in passenger side brake spider was fixed under warranty and so was down for four days, now still oweing for the rest of that week. Problem is still not fixed. The vibration pulled the wheel out of my hands hard right and almost into a ditched had I not forced it back to the left.

Brake pads are not making full compression against brake drum now but that wasnt the issue the first time.

Any advice or has this happened to anyone? I don't want to give up Merlot but this is so dangerous and I cannot afford the down time.

 

My tractor and I

 

Yes and only with loads over 35k in weight.

 

I have brake drums and pads

 

I have requested they look but they said they are going to replace drums regardless in the event they are unable to definitively declare that as the problem.