What tires are you running? Another post got me thinking, I have always ran Marathons on my boat trailers and never had any problems but read here and on fishing forums people hate them. I am buying a 5er and this will be my first camper, it comes with Marathons.
It depends on what size you have. If you have a ST225/75R15 I believe you will find Maxxis is the one most people recomend. If you have ST235/80R16 ( note most ST or Special Trailer are 80 series and most Lt or Light Truck are 85 series ) I believe you will find the best value and most recomended will be a LT235/85R16 B. F. Goodrich Commercial T/A. Michelin XPS are also highly recomended but unless you put a whole lot more miles on your 5th wheel than most of us you will be replaceing them on age and not mileage and the XPS are much more expensive. Most people replace their RV tires when they are between 4 and 6 years old.
Depends on the weight of your 5er. On most of the mid weight 5ers Marathon failures are common. I called Goodyear and mentioned that I knew and they knew they didn't belong on my weight of rig and we worked a deal to have Goodyear replace them with G614's. Depends on your rig and what you do with it. If it's heavy and you haul it all over the place get rid of the Marathons.
Dick and Joyce
2010 Montana 3665RE
Dodge 2500HD Maxi Cab Laramie Edition
Diego, Norm, & Bitsy
Ditto last reply - get rid of the Marathons and go G614's. If you do it while the Marathons are still new, Goodyear will give you an excellent trade in value and make the transition much less expensive. I got the best deal working with a Goodyear only truck tire dealer.
To answer a bunch of questions at once without quoting and to give some good advice:
The Goodyear G614 has a max inflation pressure of 110 PSI. While it will fit on most 16" trailer rims out there, many of them are not rated for pressures much above 80 psi, so they would require new rims. I priced this out recently and it did come in between 2 and 3 K.
Working with some bonafide tire engineers recently (one of whom is retired now), we came up with the following recommendation that was agreed upon by all of the "usual suspects" in tire threads:
You should not be running tires at their maximum capacity. You should have at least a 15% margin.
What has been observed in the towable industry (RV trailers, horse trailers, equipment trailers, boat trailers, utility trailers, etc.) is that manufacturers size the tires such that the typical load uses 100% or more of the tire load capacity. Running things at their limits leads to a higher failure rate.
What you will notice in research is that Maxxis makes a trailer tire, the M8008, which has a decent reputation (not perfect, but very good). If you use the 15% rule, you should get good results with them. Among all of the junk Chinese trailer tires, your best bet might be the Marathons simply because Goodyear stands behind their products better than most of the others. They have been known to pay for damages, even though they have no legal obligation to do so.
You will also note in doing research that there have been high failure rates on both the Marathon and the G614. What you need to do though, is look at the date. Many manufacturers, when receiving reports of high failure rates, simply change the brand name on the sidewall of the tire. Goodyear actually takes the information and uses it to improve their product. They have done that on both the Marathon and the G614.
One of the things a number of people have done is switch from using the ST (special trailer) tires to using LT (light truck tires). There are a number of them used, but the biggies seem to be the Michelin XPS Rib, BF Goodrich Commercial TA, and to a lesser degree the Bridgestone Duravis R250. But what you will note about all of these tires is they are all for 16" rims, are inflated to 80 psi, and come in two load ratings, depending upon the size. There are only certain trailers you can use these on. But for smaller trailers and larger trailers there are other solutions. Even with these 16" tires, the general rule is you have to go to the next size up rim in order to get an LT tire with adequate load rating. So if you have 14" rims, you have to switch to 15" rims, if you have 15" rims you get the 16" rims, if you have 16" rims, you either get a high pressure 16" rim for the G614 or you get 17.5 inch rims.
One more note: I often see incomplete information in tire posts. ST225/75R15 is meaningless. There are three different tires in this size that have three different maximum load ratings. Likewise ST235/80R16 has two different load ratings, ST205/75R15 has two different load ratings, ST205/75R14 has two different load ratings, ST175/80R13 has two different load ratings.
* This post was
edited 02/28/12 07:43am by ExRocketScientist *
I like the LT225/75R 16LT B.F.Goodrich Commercial T/A I have on our 5er.
1* 2008 Brookside by Sunnybrook 32'
1* 2002 F250 Super Duty 7.3L PSD
Husky 16K hitch, Tekonsha P3,
Firestone Ride Rite Air Springs, Trailair Equa-Flex, Champion C46540
"A bad day camping is better than a good day at work!"