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Trailer tires have a load rating such as 1750 pounds marked on them. IMO, if you are towing a 3000 pound boat any distance with tires rated at 1750 or 3500 for both then you should air them up to the full 60 PSI. More than any thing this helps with the side to side sway.

The three major causes of trailer tire failure are under inflation, constant ground contact and sun. If your trailer is parked on the lawn then certainly get the tires up and off the ground. I use old aluminum road signs under mine. If parking for long periods such as over the winter then jack the trailer up and block the frame so the tires will rotate and the springs are relaxed. Tire covers can help to block the direct sun and keep some of the rain and snow off.

One other thing when trailering is to have the weight distributed properly. Too much weight in the rear of the boat will cause the tongue weight to be too light and is very dangerous. At some speed the trailer might begin a side to side wag as I am sure many of us have seen where a trailer appears to be like a dogs tail wagging the entire vehicle. On most single axle trailers the weight at the ball should be 200 pounds and a bathroom scale on level ground can be used to check it. Your trailer should also be level when on the hitch and they sell drop down receivers in many sizes to accomplish this. Use one up side down if your hitch is lower than the tongue but get the trailer as level as possible.