While my tires were off my trailer the other day when I was having new brakes put on, I thought it looked like I was getting a small wear pattern in the center of the tires. 

 The tires will be on the trailer 2 years this August and the trailer is on the road every week during warm months and my riding park is about 30 miles round trip.  My yearly vacation is 12 hours round trip so not a lot of miles on them yet.

My tires are Power King Towmax STR 85R15 10ply E rating and the tires have 80psi on them and I've been keeping 65lbs in them.  If I'm thinking right, a center wear pattern would mean too much air but I wouldn't think 65 would be too much. 

Do I have too much air in them and if so, how much should I have?

Thanks!

You're correct in assuming the center wear pattern was caused by too much air pressure. That is the opposite of too low a pressure that causes the outside corner transistions to wear first from underinflation.

You didn't say how heavy a trailer you're pulling. An "E" range tire in a tall profile like yours, with a lighter load, will wear more in the center with lighter loads, than a lower profile tire and more weight.

I would not lower the tire pressure you're using now. As was stated, many owners run their tire pressures at the max inflation marked on the side wall. Most trailer tires will die of old age before they actually wear out. Even if the tires are showing an over inflation pattern, it may take many miles before a significant amount of wear renders them unserviceable. If you run low inflation figures, you risk overheating the tires causing a cord and sidewall damage with a resulting blow out, as well reducing their load rating capabilities. A fully loaded tire should be run at its max inflation rating to achieve its stated capacity.

I have a 21' 3 horse Sidekick Trailer and the plate on the trailer has 15,500 for weight and I believe it's alittle more with having an enclosed haypod.  It also has 80psi on it as well for tires.  I wanted to put the tires at 80 psi but my other half that doesn't ride horses and only pull boats and 4 wheelers, didn't think I should even put them at 65.   Would I find the width on the tires? 

I've had a couple of blowouts in the past and probably didn't have enough air in them or they did have some age on them.  Since there's a small wear in the center I shouldh't have to worry as much about a blow out and I'll just plan to keep them at 65..

Thanks for your input!

     Trailer tire load inflation chart... http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

    I run all of my trailer tires at their maximum inflation pressure. Some are 65 psi, some 80 and others are 110 psi... Max. pressure should be printed on the tire's sidewall.

I'm glad I put new brakes on when I did and asked what I thought was probably going to be a dumb repeat question.  I'v been lucky most of my hauling is a 20 minute drive to my riding park but I've had two vacations trips that I could have easliy had problems on the road.... 

Thanks everyone!!