[twindman]

A lot of people use TST pressure monitoring system, including me. Can get them on Amazon or etrailer or probably other places too. I think they are around $350 now. I had it save me fender damage and who knows what else near El Paso.
Alarm went of and pressure showed 40 or 45 lb. STarted looking for a pulloff but just passed (of course) an overpass exit. By then it read 30 lb. (probably only 30-45 seconds. I pulled off on top of the overpass with about 1 ft from the tire to the white line on the edge of the road. Put out my flashing warning lights and by then the tire was resting on the rim. Nothing got damaged - not even the tire. I figure I would have had rubber flailing around and destroying our flimsy fenders and maybe more.