I run Carlisle Sport Trail LH Bias on my 7K utility trailer. Good balance of price and quality.
I tow my JD 750 tractor, my Jeep (5K lbs+/ each tire weighs 160lbs!), 4 ATV's, firewood, just hauled a load of mulch and topsoil. The only issue I ever had was running over a nail and I fixed it without pulling the wheel off.