Friction creates heat thus the increase pressure. 15-20% increase is normal for summer driving. As long as the tires are within several psi of each other all is normal. If you watch you can notice the tires on the "sunny side" will increase a few psi more.
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2007 MS 36 TK3, Demco Glide Ride
2012 GMC 3500HD D/A CC, AirSafe Hitch
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