What I find crazy is failing AC condensers and radiators. Not saying it doesn't happen, but it's not something I have personally seen or heard of in my neck of the woods, where these two particular systems are in constant, heavy use.
In the Middle East, fullsize SUVs are GM's bread and butter and have been for decades. Not only are they popular with private buyers, but they're used heavily by police departments, fire departments, close protection agencies, medical centers, municipalities, television crews, military and transportation/livery companies. Even the USMP has a considerable fleet here, and much of our armored vehicles are Suburbans.
Fleet vehicles are often poorly maintained after the warranty period and as a result, breakdowns are common. Transmission failure is common on high mileage '15+ vehicles where the fluid is literally black, but it's hardly ever the cooling system or air conditioning unless the vehicle has been in an accident and components have suffered damage.
2015, much like 2007, was a problematic year and I expect 2021 to be the same. There has been a number of recalls; transmission lines and drivetrain vibrations were an issue, along with brakes at some point.
The most common repairs are brake pads/rotors, shock absorbers, control arm bushings and tires, but this is extremely common for vehicles driven in motorcades in my case, where we often accelerate at WOT, brake heavily, drive on rumble strips and sometimes jump curbs. The most common problems are with fuel injectors and spark plugs requiring early replacement as a result of bad fuel quality. Coil packs are often not behind if the plugs are replaced periodically. Oil consumption was initially an issue on vehicles with AFM, but a lot of folks opt to have it disabled.
Water pumps, usually the bearings, tend to go around the 160,000 km (100,000 mile) mark, as do cooling fans for severe duty vehicles, if not earlier. Transfer cases that haven't been properly serviced are another issue on 4WD vehicles.
The only times I have seen radiator failures are on vehicles that have suffered damage to the plastic tanks as a result of a collision, and had them repaired as opposed to replaced. They're often sealed with black silicone, which tends to give up a couple of months down the road, and slowly leaks. Aftermarket radiators also tend to have issues with the transmission cooler.