I have used infrared temp sensor from Harbor Freight for about 5 years. I have a 36' DP and always check the tire temps and the toad tire temps and have developed a range that is "normal" for both the RV and the toad. I also check the radiator/CAC and tranny cooler temps since I don't trust the dashboard instruments. It is interesting to see the temperature difference in various parts of the radiator. I have consistently found that the drivers side tires have a few degree higher reading due to the road crown on most 2 lane highways, but not on most interstates. However, one note of caution when using the Harbor Freight device...it is very sensitive to the condition of the batteries. Even though you will get a reading from the device when the device batteries are not fresh it will give you false readings. you need to keep fresh batteries handy for it.
