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Old 02-22-2016, 02:50 PM   #1
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Hate to do this.. but... tires??

I've been reading over the past several months about how cheap the tires are for OE and to upgrade. Yes thousands of people don't have blow outs but others do and I know a blowout can usually cause a ton of damage to the camper. My brother in law as a 10k travel trailer that is 9 years old and has never had a blow out so I know it doesn't happen to everyone.

So I don't want to ask the same questions that get asked all the time but it seems I may be in a separate category then others.

My 5th wheel has a GVWR of 14,000lbs and when I looked at my tires, they are rated at 3,560 or just leaving me at 240 pounds over the GVWR.

So I began my quest in looking at other tires options. With my tire size, 235-80-16, the MAXXIS are rated at 3,420 and the Marathons are rated at the same 3,420 per tire essentially reducing my GVWR by 320lbs if I even attempt to max it out.

Dry weight is about 11,300 and although I have not brought it to a scale yet (I will this spring), I'm guessing I'm in the low 13s for weight by the time I add everything (bikes, mini fridge, all hoses/pipes, grill, bedding, pots pans etc etc).

I've tried over the past year to keep my speeds at the max rated of 65mph but sometimes it's just too easy to travel 70-72 on the open highways.

So if I can't get the Maxxis or Marathon tires, why do I go with that has at least a 3,600lbs rating each so I have a little wiggle room for safety??

PS - I'm still researching on my own and reading more threads but I'd love to hear recommendations on the above.
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Old 02-22-2016, 02:59 PM   #2
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Hate to do this.. but... tires??

Your forgetting the additional weight that is carried by your truck not all 14k is on the axles.


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Old 02-22-2016, 03:01 PM   #3
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Quote:
Originally Posted by TURBS View Post
Your forgetting the additional weight is carried by your truck not all 14k is on the axles.


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Great point.. so if my pin weight is 2,200lbs, I need to subtract the pin weight from the total camper weight to determine what the weight is on the tires?

I appreciate the bit of info that didn't even dawn on me.
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Old 02-22-2016, 03:02 PM   #4
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First, your tires only carry what your axles carry which is the GVWR less the 15-25% that is carried by the pin. My camper's weight is rolling in just shy of 17,000 lbs. but my axles are only carrying about 14,000 lbs.

Second, make sure that you have space between your tires for the higher capacity tires. They generally have a larger overall outer diameter than the lower carrying capacity (within the same load range). I had less than 2" of space with my Maxxis m8008 @ 3,420 lbs. per tire.

Finally, the major options are possibly a Sailun tire or the Goodyear G614. If I recall correctly, the G614 has 3,600 lbs. of carrying capacity. I think Sailun has an equivalent tire. I didn't look at them extensively as their outer diameters were problematic for me.

OR, you could go crazy and replace the rim/wheel + tire and go with a 17.5" rim and a commercial trailer tire. The ones I'm rolling on have 4,900 lbs. of carrying capacity each.
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Old 02-22-2016, 03:02 PM   #5
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Great point.. so if my pin weight is 2,200lbs, I need to subtract the pin weight from the total camper weight to determine what the weight is on the tires?
Yes.
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Old 02-22-2016, 03:06 PM   #6
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Because 20ish% of your weight is in the bed on the hitch. So you're not carrying 13,000 on the trailer tires, it's more like 10,500.

So you should have plenty of margin. The scales will tell, but that should be close.
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Old 02-22-2016, 03:10 PM   #7
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Thanks, once the snow has melted, I'll take it to the scales and see where we are at. I have everything still packed in there except for clothing and food so I'll be within a few hundred pounds of what we normally have. Once I know that, I'll go back to the Maxis or Marathon.

Much appreciated!!
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Old 02-22-2016, 05:09 PM   #8
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No matter what kind of tires you buy, the most important thing that you can do is buy a TPMS and put on the tires. Get the TPMS first.


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Old 02-22-2016, 06:11 PM   #9
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No matter what kind of tires you buy, the most important thing that you can do is buy a TPMS and put on the tires. Get the TPMS first.

I fully believe that my TPMS fully paid for itself when I got my flat AND prevented it for quite a while before. It would have prevented it entirely if I wasn't such a dumbass.

They don't catch all scenarios, but they do enough for me to agree and consider it essential.
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Old 02-22-2016, 09:28 PM   #10
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I just returned from an 8 hr trip through GA and into Alabama. I traveled I-75, I-85 and I-95 to and from. On the way over, I passed two TTs on the edge of the road with flats and 6 on the way home. Two of the 5th wheels were three axle units and both had blowouts [tires ripped to pieces] on their middle axles.
I don't remember seeing any small, light weight units with flats over the past few years. My Keystone Passport never had a flat in five years and at least 20,000 miles.
It makes me wonder what the correlation might be if not weight alone?
Stopped once to let air OUT of the tires as they were approaching [92psi] "critical mass" [96psi warning] and the ambient temps were going up by 30*. They were brought up to 80psi when I left the CG for the trip home. The temp was 49*
I would never travel again without a TST 507 on my dash. Need to know real time what is going on back there.
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