* I have not yet seen a warranty that will actually cover costs and labor for things that could be stretched to be considered MAINTENANCE items.
Bogie wheels and bearings, driveline bearings, suspension pivots and bushings, DRIVE BELTS, BATTERIES, Exhaust Valve Cleaning, Control Switches, Body/Windshields that discolor or crack prematurely.
* Then you get into the area of insufficient strength or construction or materials or bad design, that can be diagnosed by that great GRAY AREA... CUSTOMER ABUSE.
Parts that may be prone to this, in the past, went from things like rail mounting holes egging out, to failed front/rear torque arms, cross shafts and even shock tower frame members cracking. Loss of Engine Compression, poor performance, bad fuel economy, excessive oil usage, overheating, poor starting. Some sleds have had known driveline weaknesses, from secondary buttons, wear bushings on clutches to drive shafts that break.
The warranty company marketing department, realizes that the term "Bumper to Bumper" is very attractive and comforting to the purchaser.
Their division that manages warranty claims, is probably very familiar with the many reasons to deny a claim, a few of which I posted above.