If your vehicle still has the tyres on it that came when the car or truck was manufactured, or you've always replaced those tyres with the exact same size and brand, you may want to think about an upgrade or replacement at some point. Larger tyres, those with deeper tread, or tyres with thicker or better-quality rubber can improve your vehicle's performance in a variety of ways, and even keep you safer when on the road. Note when you may want to upgrade your vehicle's tyres and why this can be a good choice for your car or truck.
If you regularly drive over gravel or dirt roads, and notice that your car's underbelly is always suffering dents, dings, and other damage from this flying debris, you may need new tyres. Heavier and wider tyres with deeper tread will do a better job of actually pushing down that gravel rather than pushing it aside, so that it then doesn't fly out from under your car. Those larger and wider tyres will protect your car from all that damage, and also give you better traction and more control when on rough and uneven roads.
Driving over soft soil or muddy roads puts added wear and tear on the engine and transmission as they try to power the car forward without sinking into that soil or mud, and getting stuck. Tyres with deeper and better quality tread will help to actually grip soft soil, mud, snow, sand, dust, and other rough road surfaces; this means less risk of getting stuck, as well as less risk of overheating or of wearing out the gears of the transmission.
Towing or any added weight
If you've added significant weight to your vehicle, such as with a caravan or trailer you tow, you want to consider getting high-quality tyres. Wider tyres with deep rubber, and a tread design meant to withstand the pull of that added weight behind your vehicle, can reduce the risk of your vehicle sliding around when on the road. This is especially important when your trailer resists a turn or curve, as your vehicle can easily flip if your tyres don't provide adequate traction. Better tyres that provide that added grip and traction can also mean less wear and tear on the engine and transmission as well as the brakes, all of which need to work harder to pull the added weight of a trailer.