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Old 07-28-2015, 10:48 PM   #1
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Exclamation Tomax blowout

I have a Pinnacle 36KTPS the Tomax 235-16 80 right rear tire blew on the freeway. I took delivery in February 2014 and I have about 8000 miles on the tires. I cruise at 62 miles per hour and always check for 80 psi before every trip. The tires have lots of tread left. When I got home I noticed the remaining 3 tire treads were bulged indicating tread seperation. I started to look at the trailer weight limits and discovered that the tires and wheels are not rated for hitch unloading (dynamic loads). Jayco calculates 20% of the weight to be on the truck. The problem is dips in the road cause dynamic loading far greater than the rated capacity. I also looked under the trailer for any damage and found that the Dexter axle sticker stated the capacity at 6000 pounds each. When I calculate 20% of the 12000 pounds and 1000 pounds of cargo weight being on the truck, the axles are overloaded by 626 pounds static. The Dexter axle site says that trailer manufacturers should account for dynamic loading. I contacted Dexter and asked if the warenttee would be honored under these conditions. They said if the axles are overloaded they would not be covered. I contacted Jayco and I am waiting for their them to call back. The cargo capacity stated on the factory sticker is 2600 pounds. With the axle capacity at 12000 pounds my true cargo capacity is only less than 400 pounds with a full load of fresh water. We dry camp and need to travel with water often.
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Old 07-28-2015, 11:00 PM   #2
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We have a 2013 Jayco Premier 321RLTS. We have had to replace all Towmax tires. The first one had a bluge (inner separation). We replaced that one. Have always checked the tire pressure and I do not travel more than 65mph. We had a blow out, the rear right tire. When we bought new tires, we found the other 3 (one being the spare) were also bad. After investigating 5th wheel weights and tires, I believe the axels, wheels and tires are definitely undesized for the weight and size of these 5th wheels. My brother-in-law recently bought a 5th wheel from a different manufacturer and they also have the same size of Towmax tires we had. Their 5th wheel is larger and heavier than ours.
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Old 07-28-2015, 11:19 PM   #3
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I went to trailertiresandwheels.com and they recomended 17.5 inch wheel with medium truck tires with a load rating of 4800 punds each at 120 psi. I still need to get the axle issue resolved.
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Old 07-29-2015, 05:03 AM   #4
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I am no expert but did stay in a Holiday Inn Express once.

I believe that Dynamic loading is a fact and that is designed into the tires specs. Any time you have a heavy rig that is loaded, the more extra capacity you have the better.
All manufacturers IMO cut the tire capacity to the minimum needed to be legal, leaving no wiggle room.

Anyone who believes after all the chatter on forums and real life experience that the problems with Towmax tires don't exist is living in a dream world.

I had Marathons that are supposed to be a much better tire, do the same thing with blowouts and separation. I am not overloaded but the tires are the weak link in load carrying capacity and they do fail. I upgraded to G614's and have had no more problems.

IMO manufacturers should offer tire upgrades as a matter of routine business but to do that would be admitting the fact that the std offer is the bare minimum.
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Old 07-29-2015, 05:09 AM   #5
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I also changed my "E" rated tires (I had marathons) to G614's. It just wasn't worth the risk and now I tow much more relaxed. I was continuously looking in the mirrors expecting to see pieces of rubber and my rig flying off. Expensive - Yes, but worth every penny.
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Old 07-29-2015, 07:31 AM   #6
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Quote:
Originally Posted by edatlanta View Post
I also changed my "E" rated tires (I had marathons) to G614's. It just wasn't worth the risk and now I tow much more relaxed. I was continuously looking in the mirrors expecting to see pieces of rubber and my rig flying off. Expensive - Yes, but worth every penny.
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Old 07-29-2015, 08:37 AM   #7
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I also just changed from TowMax to the Goodyear G614s. Before the change I had the rig weighed getting individual wheel weights. I would not have believed that there would be a significant difference in weight on the four trailer wheels. I weighed with a full fresh water tank and empty grey and black tanks. The trailer weights are: door side- 2650 front and 2375 rear, off door side- 2850 front and 2925 rear, pin weight is 3025. All weights are pounds.
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Old 07-29-2015, 08:40 AM   #8
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LT 235/85R16 Load Range G 14 Ply Goodyear G614 RST Unisteel Radial Trailer Tire

This tire requires a special high load capacity wheel and high pressure valve stem.

Do the standard Jayco rims comply to the above statement from Goodyear?
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Old 07-29-2015, 12:54 PM   #9
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Hey Jack, your story matches ours pretty closely. We had around 7500 miles on the TM tires and lost 2 within a 75 mile stretch. It's like they had timers. A third tire had a large bubble and was getting ready to join his brothers on the roadside.
We bought the G'year 614's and tho we don't have any significant miles on them yet I breathe a bit easier.
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Old 07-29-2015, 01:07 PM   #10
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Quote:
Originally Posted by MikeNChelle View Post
LT 235/85R16 Load Range G 14 Ply Goodyear G614 RST Unisteel Radial Trailer Tire

This tire requires a special high load capacity wheel and high pressure valve stem.

Do the standard Jayco rims comply to the above statement from Goodyear?
I'd like to know this too. I'm wondering if the wheel may be a limiting upgrade factor for some of us?
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