When your pulling out of the campground and get that small nail in your tire and then your planned first stop is 3-4 hours down the road, exactly when are you going to use the ir to see your tire is either flat, destroyed from driving for miles with not enough air or so hot you can't touch it? Spending the money just might keep you from having to buy a new tire, or worst yet, sitting along the side of some expressway with 70 mph plus cars and trucks flying by inches from you and your rig. Make no difference to me what you do, but I never move my RV without the TPMS on and operational.And yes, it has saved me money letting me know a problem long before I had to replace a tire.