With campers, towing, truck camper or any high payload weight you will also need to keep an eye out for pressure going UP.
In the desert on hot pavement your tire pressure can double easily. Tires are usually fine up to double the max pressure stamped on the side just to cover any defective tires.
All my blowouts have been from hot and over-pressurized tires.
A friend has the cheapo internet china bluetooth tire monitor on his and love it, says it works great. However, my tires, at 80 psi, are over the 50psi max that these can do or I would have them. There are higher pressure ones available for higher prices.
Most tire flats, unless you cut it or hit a really big spike, will be slow leaks, or slow psi ramps, so worrying about one or 4 minute intervals not such an issue.