Open Roads Forum

Print  |  Close

Topic: Load Range for Tires

Posted By: mycopsycho on 03/04/10 10:47am

I'm looking for some advice about a preferred load range for trailer tires. I have a 2007 22ft Bigfoot trailer with tandem axles. The trailer loaded weighs about 5500#. The factory equipped Marathon tires are C rated. I have to replace at least two of my trailer tires as a result of my axles being out of alignment...from the factory. Have had that fixed but I blew through two tires in the process. Anyway, I'm thinking D rated tires might be best as replacements for all four tires on my trailer and just keep the two good C rated tires as emergency replacements for an upcoming trip to Alaska this summer. Any thoughts about preferred load range on trailer tires?


2007.5 Chevrolet Silverado 2500HD LTZ cc Duramax(LMM)/Allison with Titan 52-gal fuel tank, Edge Insight CTS
2012 Arctic Fox 25R


Posted By: Gale Hawkins on 03/04/10 11:05am

I would move up personally if your wheels can be fitted with the Class D load range tires.


Posted By: RRUGG on 03/04/10 01:42pm

Having more tire capacity is in the same category as having more truck capacity IMO.


RRUGG
2009 Chevrolet Silverado LTZ 1500 4x4 5.3L
2011 Kodiak 281RLGS travel trailer
2011 Egg Camper
2010 Chrysler Town & Country
Good Sam life members
Bob & Grace professional retirees


Camped in 49 states. Missing Hawaii.


Posted By: skipnchar on 03/04/10 02:26pm

C rated tires will MORE than handle your trailer weight and there is really no REASON you'd need more. My 8,000 lb. Rockwood has C rated tires and so far I've had two sets of tires on it. Both were C rated and the first lasted 45,000 miles (goodyear Marathons made in New Zealand) and the second Maxxis now has 35,000 and is still going strong. I've had one puncture flat that was repaired, on the Marathons. Keep the inflation at maximum, check if often and keep speeds to a reasonable 65 or 70 MPH.
Good luck / skip


2011 F-150 HD Ecoboost 3.5 V6. 2550 payload, 17,100 GCVWR -
2004 F-150 HD (Traded after 80,000 towing miles)
2007 Rockwood 8314SS 34' travel trailer

US Govt survey shows three out of four people make up 75% of the total population



Posted By: david_42 on 03/04/10 02:10pm

Right now you have less than 1400 lb on each tire. 14 inch load range C tires run around 1800 max.load. Sounds like you have a huge safety margin already.


Posted By: Center Pin on 03/04/10 11:23am

If your rims are rated for it absolutely upgrade, the cost difference is not much.


Trailer: 07 Tango 299BHS w/ 225/70R15 LT Load Range D

TV: 2004.5 Dodge 610 CTD 3500 QC 48RE 2wd Laramie SRW, FP Gauge, FASS 95/95, Rhino Lining, Hensley Arrow, Air Bags & Compressor, Canopy, Custom Boat Rack.
Been running B100 home brew June 2008!



Posted By: mowermech on 03/05/10 09:44am

JIMNLIN wrote:

Moving up to a D requires a 65 psi rated wheel.


"requires"? Why?


CM1, USN (RET)
2002 Fleetwood Southwind 32V, Ford V10
Toad 1: '06 PT Cruiser, Kar Kaddy dolly
Toy (and Toad 2): 2001 Dodge QC SWB, 360 Magnum, Auto, 4X4
"When seconds count, help is only minutes away!"


Posted By: JIMNLIN on 03/05/10 11:58am

mowermech wrote:

JIMNLIN wrote:

Moving up to a D requires a 65 psi rated wheel.


"requires"? Why?


OK. We've been through this before but for the benifit of folks new to tires used on trailers I'll post this again.

Goodyear trailer tire pressure recommendation says :
Special Considerations

RV TRAILER TIRES
" Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up."

We are talking about tires used on a trailer.
If the OP is going to the trouble of uprating a tires load range why shoot youself it the foot by installing a tire on a trailer that you can't use max tire pressure. The tire will run hotter than without max pressure. Running hotter than need over time can shorten a tires life.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

'03 2500 QC Dodge/Cummins HO 3.73 6 speed manual Jacobs Westach
'97 Park Avanue 28' 5er 11200 two slides


Posted By: JIMNLIN on 03/05/10 06:59am

I'm not of the more tire is better thinking. You can have too much tire for a trailer. I agree with others that the C load range has plenty of sidewall strength for your small trailer. Moving up to a D requires a 65 psi rated wheel.

Your problem IMO is tire reliability. Their are several LT235/75-15 C load range tires out there that will give you years of ST tire related issue free use. If you want to move up to a D the Goodyear Wrangler LT215/75-15 D will make a great upgrade from any ST brand. Their not restricted to 65 mph as the ST tires are. Maxxis makes several sizes of 168 Bravo 15" LT commercial grade tires. Check them out.


Posted By: mycopsycho on 03/04/10 02:53pm

david_42 wrote:

Right now you have less than 1400 lb on each tire. 14 inch load range C tires run around 1800 max.load. Sounds like you have a huge safety margin already.


Forgot to mention that I have 15 inch tires on my trailer. I appreciate the comments so far.

Is there some place on the rims that I can check to see if they would handle D rated tires?


Posted By: david_42 on 03/04/10 04:54pm

Most of the time there are no markings on the wheels.


Posted By: coolbreeze01 on 03/04/10 04:54pm

There may or may not be a psi rating on your rim. I couldn't find a rating on my aluminum rims, even dismounted, so I put on load range E tires. More tire than I need, and that's what I want.


2008 Dodge 3500 With a Really Strong Tractor Motor...........
LB, SRW, 4X4, 6-Speed Auto, 3.73, Prodigy P3, Blue Ox Sway Pro........
2014 Sandsport 26FBSL


Print  |  Close