Originally Posted by MacDaddy
Whatever you do run them at their maximum tire pressure and have them balanced!!
I agree totally on balancing them. It is worth the money if you have ever seen unbalanced trailer tires bouncing down the highway.
As to pressure, you should run the tire at the correct pressure for the weight they are carrying. There are many charts for what this pressure is supposed to be.
Having said that, most manufacturers put the cheapest load range possible on their campers and at their max camper weight, the pressure should be at max for that tire.
Running at max when the tire is not loaded at max, however, causes wheel hop (excessive bouncing to your goods inside) due to stiff sidewalls and center tread wear from over inflation. Conversely, under inflation causes wear to the outer edges and excessive heat buildup from unnecessary sidewall flex.
Check with your tire manufacturer's web site for their inflation chart.
Here is a MAXXIS load chart as an example.
Weight your rig hooked up (so pin weight or tongue weight is on the tow vehicle). Divide the weight on the trailer tires by the number of tires on the trailer for the individual tire load. Inflate accordingly to ensure maximum tread contact with the road.
Too much pressure, tire is rounded like a donut and only the center of the tread touches the road. Too little and the tread is cupped in the center and tread contact is only at the edges.