Have you ever seen someone checking tire pressures?

I check and fill to the required cold 80PSI prior to every trip. The tires seems to lose about a 1/2 a lb per month and changes in ambient cold temperature at a different location can also effect the reading. While travelling, I visually check to see if the tires have the same squat and also check all the hubs and all the tire sidewalls, TV and 5th wheel, temperature at every stop with the back of my hand. Anything unusual, that is noticed, the tire gauge comes out immediately.