What is “Peace of Mind” worth to you? The last thing I want to be thinking about when on vacation and driving down the road loaded to the max, is whether or not my tires are going to “Blow out”.
First …get yourself a good tire monitoring system, that way you don’t have to go around checking pressure every stop. They will tell you if you have one going low and even if they are heating up, (Usually from bearing issues). My system even has sensors on my trailer (6 wheels) plus the duals on the truck.
Next … make a deal with a trucking company that will take you’re lightly used tires (for a good price) they will use them on trailers, I won’t let my tire tread wear get past 50 to 60%. Don’t carry a spare and knock on wood, never had tire issues.
If you know you are going to be loaded most of the time or for long distances, get more side wall plies or a higher load rating.
Never “Cheap out” on tires, it will bite you on the a$$ in the end.