Hello all--next question. I have Carlisle 5.30-12's tires on my NTM pup---previous owner said he purchased new tires beginning spring/summer of 2017--they do look new--I still need to look for the date of the tires' manufacture 1. How does the date of manufacture read on the tire? 2. Tire inflation---from what I can see on the side of the tire it says "at max 80 P.S.I cold"?? Is that 80 PSI Max correct??? The tires on my truck only take 35-40 PSI. Or are these trailer tires more like a more heavy duty truck/trailer/tractor tire?? 80 PSI seems awfully high Thanks for any info!