Endurance Vehicle Protection Denied claim or truck after covered part failed and did more damage Northbrook Ill

Covered part failed, hyd. slave for clutch which caused the pressure plate, cutch and flywheel damage to be damaged.  Dealer mechanic showed the service manager and myself the failed part and damage it caused by the slave cylinder going bad. 

Endurance rep claimed that since truck had 1 1/2" lift kit on it (still has Chrysler factory shocks on the front) and after market wheels and big tires and that caused extra stress on drive line.  Factory wheels and the tires that came on the truck were 245 x 17" and the tires now are 285 x 17" and these fit on factory wheels that are still on the truck.

So how does a supposedly 1 1/2" lift and 2 sizes bigger tires on factory rims cause the hyd slave cyliner to go bad. The mechanic and service manager both said the hyd slave cyl went bad before I ever mentioned I had Endurance.