Blowouts!!!!!!! Tires????

dlhancock wrote:
We are running Power King/Tow Max tires on our 33 ft. KZ 5th wheel toy hauler. It has duel axles. We bought our trailer new in 2006. The GVWR on the trailer is 13600 lbs. Actual weight of the trailer is 9170 lbs.
When we load it with our Harley Tri-Glide, water, propane, food and clothes, we figure we are at about 12000 lbs.
We always run at 80 psi, and have an electronic monitor on the tires to keep an eye on them going down the road.
The reason I'm writing is, we have had many blowouts on this trailer and don't know what to do. We had the axles changed in 2010 from 6000 lbs. to 7000 lbs. because they were bent and now they are straight and in alignment. The dealer (who is no longer in business) suggested not putting 80 psi in the tires which is stamped on the tires. We knew that was wrong.
The tire size we are running is: ST235/80R16 10 ply
This tire is stamped, for duals 3080 lbs per tire. Just had another blowout. Only thing we can figure is the tires can't take the weight.
Has anyone else come across this problem and what did you do to fix it? We were wondering if a 14 ply tire would solve the problem, if the tires would fit or if this would create a new problem.

You don't have duals on the trailer...that load rating refers to tires mounted dually...as in a dually pickup truck. The load rating will be as stamped for single axle use. You have tandem axles, not dual.

The problem is likely twofold. First, Towmax are notoriously bad tires. I've had em...and had problems with em. Secondly, the weight of your trailer is likely too much for the load rating of the tire...which is very much affected by the amount of air you put in the tire.
In my case, my rig came with E rated tires and I upgraded to G rated based upon an assessment of the weight on the trailer axles as well as my desire to have a significant amount of excess capacity to avoid overloaded tires. If you have already straightened out your axles...you many be running heavier than you think. Weigh the rig, and then either get your weight in line with your tires and axles or vice versa. Either way, towmax are junk. G rated tires will max load at 110 psi and the primary brand for trailer use seems to be Goodyear G-614. You have to ensure that your wheels are rated for 110 psi before making the switch...if not you will have to upgrade your wheels.