Keep in mind, the Powertrain (internals of the Engine, Transmission, differentials, transfer case, u-joints, CV Joints, etc) are covered to 5yers and 60K miles by GM. And certain Emissions systems components (catalytic converter, engine control module, transmission control module, and other diagnostic-emmisions-critical electronic control uints) are covered to 8 years or 80k miles. See here -->
https://www.chevrolet.com/owners/warranty
So...your "extended warranty" which is really a Vehcile Service Contract is only covering other stuff, past this...
You might consider sticking the $$ in a high yield savings account and holding on to it until it is needed and see how you come out...my bet is you come out ahead. It has to be this way, statistically, or every VSC seller would be losing their shirt. Generally, a vehicle service contract is a financial product designed to make the seller money.
FWIW, when I traded my 2013 Suburban LTZ, I decided to total up the
non maintenance repairs I made on it over the 9 years and 115k miles I owned it. The answer: ~$1500 (brake caliper, one autoride shock, rear air leveling system compressor, a couple sway bar links, and a couple other little things). This data made me decide to not consider a VSC... Admittedly, I am a stickler for maintenance; I do everything by the maintenance schedule in the owners manual for "severe" service, wash my vehicle often, am mindful of corrosion and take steps to mitigate it, and fix things as soon as they start to appear problematic, vs delaying anything...My actual maintenance expense in thie same period was about $2200 (Oli changes on schedule; transmission, transfer case, differential service every 45k miles, brakes/rotors was once; air filters on time; sprak plugs at 100k; brake fluid exchange every 4 yrs or 45k miles; etc)