I too keep my trailer tires 50 psi all the time. In my mind I see no reason not too, and a few benefits for doing so, mainly less rolling resistance, and better lateral stability.
__________________
2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln