A few years back, I bought a new 1/2 ton. I tried to get some E's put on right away but they were all backordered in the tire I wanted. I waited a while and drove the truck sparingly. After several weeks I finally gave in and loaded up my camper and went camping with the P tires. They held 44 lbs of air and had a decent load rating with maybe a 10% margin for my load. I remember both the tire guy and the truck dealer telling me those load ratings are for 100% running . If you are a little over once in a while no biggie. I only have my camper on about 10-15%. Anyhow I ran those P's for 50K miles untill I sold the truck. They still looked great and had plenty of tread. I am good at checking the air pressure and rotate every 10k. You do get a little more sway than an E with a stiffer sidewall. I would run the P's unless I was uncomfortable with the way the truck handles.