Originally Posted by wildwoodtraveler
As a newbie, relatively speaking, should I be running the trailer tires at their max and the truck tires at their max when traveling? Trailer is 50psi; I ran 45psi last Fall on long road trip (dual axel). Truck is 65psi max. I kind of figured with hot weather I should drop the pressure a bit from the max.
This has been a hot topic for years on this forum. I have spent a great deal of time doing research and a good amount of money in prevention, and I'll share what I've learned:
RV manufacturers put the minimum rated tires on the RV for their GVW. So, if you are heading out on a weeks vacation, chances are your tires are at the max weight rating or over, your tires may be overloaded. Get tires with the next higher rating if needed.
Weigh your rig, fully loaded. Know how much is on your tires and have plenty of buffer room.
There is a code on your tire that will tell you the month and year that your tire was manufactured. Don't be surprised that you have a 3 year old tire on a brand new rig. Replace your tires every 4 to 5 years. DON"T WORRY ABOUT HOW MUCH TREAD IS LEFT, it's what you can't see that's going to get you.
Run your tires at max cold pressure inflation (measured at 65 degrees). I found that adjust 2% for every 10 degrees difference in ambient temp (if it's 75 deg out when you check your tires, account for 2% higher pressure in them). This is ONLY for when the tires are cold, you haven't moved in 6 hours. As you drive, tires create heat, tire pressure increases, this is factored into the max cold tire inflation pressure by the tire manufacturer. The closer you run to the max weight of your tires, the more heat is created, the more pressure builds up, the more chance you have for tire failure. If you run your tires lower than the max inflation pressure, you don't get the max weight rating of those tires. The side walls will be flexing, creating more heat, and excessive wear to the plays of the tire. Under inflation can be one of your worst enemies.
My Tow vehicle runs at max tire inflation all the time, 80 PSI. Same thing applies to you vehicle. The vehicle manufacturer is looking for the median of weight and comfort. I can't be comfortable towing, if my tires aren't right and I confident that I have prepared for a safe trip. Look at the actual tire of your vehicle and make sure that the tire are the right rating for what you are towing (again, when you weigh your rig). Many people are surprised what they find out.
I hope this may help some of y'all out. I like to share what I've learned. The internet has all the info to back up what I suggested.