Tire Inflation

I recently replaced the tires on my travel trailer that were four years old and rated at 65 psi maximum. The new tires are rated at 80 lb psi as are the alloy wheels on the trailer. I'd like to increase the air pressure above 65 psi to provide an extra load safety margin. Any problem with this? The inflation max on the trailer side plate is 65 psi, (based on the original tires, I assume). PS I did have a blowout on one of the old tires last year on a very hot day and the tire was inflated to 65 psi.

Rogerck