I was thinking t/c's would be different than class A motorhomes when it comes to setting your tire pressure. I think of the semi drivers who do not change their tire pressure every time they change loads.
I did bump my steer tires up by 10 lbs and did not notice any real change in ride. Right now for the most part I think I am 10 lbs under max cold ratings in all.
I also think if the tires are not inflated enough you damage the side walls. Just would think going with the max cold would be best for the tires and mpg. But I can be wrong in my thinking.
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Renegade Garage Rig
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