Run them at max psi or maybe a 1-2 less. Under inflation can cause the tire to deteriorate quicker because they deflect more as it rolls, which builds up heat. Not to mention fuel economy. Over inflating is just as bad. Less tread contact on the ground.
2013 Jayco Eagle 328 RLTS
2013 Ford F350 6.7L 4x4 CCLB W/Air Lift air bags
2002 Coleman Bayside Elite (traded)
Me, Momma and Charles (RIP buddy)
And introducing Sofie!! ;)