I bought a cheap Chinese TPMS for about $100 last year to use on my Jeep Wrangler when I'm towing it and now have about 20,000 towed mies with it. Over my Christmas camping trip one sensor was showing low pressure but that was due to the batteries needing replacement in the sensors. Stopped at Walmart and picked up $20 worth of button batteries and installed them in the sensors. Less than 200 miles further down the road the warning alarm went off and by the time I got pulled to the side of the road the tire was down to the rim. Figure the TPMS just paid for itself since I saved the tire and didn't do any damage to the rim.
