04' Tacoma - Tires Terrible In The Rain

I have a 2004 Tacoma 4x4 with the standard size 265/70/16 tires. I have been through quite a few different brands of tires and the tread life is horrible on my truck. (my truck has been aligned and I rotate my tires every 5,000) My latest set that is still on my truck is the Firestone Destination A/T's which have about 27,000 miles on them. They are so bad I can't drive in the rain without my 4x4 activated because I either cant get traction or the rear keeps sliding out around corners.
I understand this is a light truck in the rear end but there has to be a solution for this. I have played with different psi in the tires and landed on about 37psi in the rear and its a little better but still have to use 4x4.
I am looking at Cooper Discoverer A/T3 to try next and would really appreciate anyone's opinion on them or if they have any ideas of what else I can try.

 

thats weird i have the same tire and same size, mine do very good in rain and my have almost no life left in them.

 

37 is too much. go with the pressure on the door for factory size tires. I wouldn't run over 32 psi.

 

Yeah I am out of ideas. At 27,000 miles these things should be at only half their life. At 32psi my truck was down right dangerous to drive in the rain. I have had a truck for the last 20 years so I am not new to this either.
I took my truck to Firestone when it was raining and the manager came out to look at it. He said he would take it for a ride to see what I was talking about. He made it about 500 feet down the road and my truck slid out around a corner and the guy about crapped himself. He said he had no explanantion and that they would give me 50% towards new tires but they marked up the price of the new tires so much it was still around $600 so I walked out.
I don't understand how some guys can say they have no problems in the rain and other guys with the same truck, same tires, say their truck is absolutely horrible.

 

yea we basically have the same truck i got a 2003. that is weird