not an absolute necessity if one is stuck on the side of the road, but something to block the wheels is always advisable. at the house I just use bricks or spare scissor jacks that don't work well anymore to chock my wheels. im not spending my money on overpriced piece of plastic to hold my tires when I have countless things at the house with which to do so that function all the same for all intensive purposes. I would not take up cargo area to hold wheel chocks for the few times your ever changing tires on the side of the road, when you check your air pressure monthly or so check the tread you can see all the way around for rocks or other objects stuck in the tread or tread grooves this can prevent many a flat before they happen. so everyone knows discount tire does free air checks and flat repairs even without you buying your tires there, so if you find something in your tire swing by and ask them to fix it. when checking your pressures remember its best to do it cold (before you drive at all for the day or 3+ hours after driving) and follow the pressure recommendations on the door, unless you know where to set it otherwise (I kept my stock 205/50/17s at 34psi but the door said 32 because 34 gave me better road feel and comfort about the same handling and helped mpg slightly.) ad keep an eye for one or more that are well below the others or where they should be and check it carefully for punctures. aka if they are supposed to be at 32 and you check and 3 are at or close to 30 but 1 is at 27 then check that one really good for nails or something in the tread causing a slow leak.