If age is a problem then the tires will have cracks inthe rubber at the
sidewalls. Long term uv exposure causes it. If no cracks then they are
fine if they have enough tread. Replace with the same load range. Most
trailer tires are not radial and there is no advantage to having radial
tires on your trailer. I too have a trailer/boat in the 2500 range without
brakes but I've heard that some states now have a lower limits like 1000lbs.
Not sure how they would ever enforce it. For what it's worth the trailer
greatly lengthens your stopping distance, regardless if the tow vehicle can
handle it or not. On wet surfaces a sudden stop in a curve will cause you
brakeless trailer to try to pass you. But I'm not adding brakes either so
you make your own choice. And drive appropriately. As to the speed
problem, use your cruise control.

"secretagent" wrote in message
...
I want to replace my trailer tires because of age. I want the most reliable
tires I can get. Should they be LT or T? Radial or bias? Does load range
matter. Max weight will be 1800 to 2400 lb including trailer. Should the
spare be replaced too? I will try to keep the speed down to 60 to save gas
but my speedo has a tendancy to creep to 70 or 75 when I'm not looking. I'm
not planning on adding trailer brakes as the tow vehicle is rated far
beyond the combined vehicle weights. Is that OK?