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Tire load rating vs Trailer load rating

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Tire load rating vs Trailer load rating

Old 05-23-2020, 12:22 PM
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Default Tire load rating vs Trailer load rating

I'm rebuilding the trailer that came with my GW 18' CC, it's an older SeaLion S-18-2450 single axel. Back then they built them with 4x3 frames, they currently built them with 3x3 frames.

They currently go up to 3600 on a 4x3 frame in that length and since replacement axels only come in 2200 or 3500 I thought I'll go up to a 3500# axel and springs.

My tires are currently Loadmaster 205/75 r14 with a load rating of 1760 @ 50psi. max. I notice that on most 3500# trailers use a 215/75R14 or a 205/75R15 with closer to a 2000# rating.

Total weight of boat, trailer, engine equipment and gas will be around #3200 (original trailer was apparently overloaded!), is it necessary to uprate the tires? If so better to go with wider 14's or 15's?

thanks,

Rob
Old 05-23-2020, 03:01 PM
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Running your current tires at their maximum rated PSI of 50, your estimated load of 3200 is 90% of the tires' maximum capacity of 3520. That certainly seems adequate, but for an extra margin of weight carrying capability, I'd look for tires with a higher load carrying capacity, such as the 2000 you mentioned. Tire construction plays a role in the capacity rating, so the load range is what you have to look at, more than the dimensions.
Old 05-23-2020, 03:37 PM
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The 1760# tires are load range C. The ones closer to 2000#'s are load range D and have a max psi of 65#. Get the D's for added safety
Old 05-23-2020, 11:34 PM
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My boat was probably close to 90 of the trailer capacity. Tandem axle. I just upgraded to D rated tires and of what a difference! No more sway back there. Plus ther are radial vs bias. I'd spend the few extra $ on D rated tires.
Old 05-24-2020, 06:37 AM
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My boat setup is about the same as yours. I installed Carlisle Radial Trail HD 205/75/14 in D range on mine last year. So far so good.
Old 05-26-2020, 04:53 PM
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I Have tried most trailer tires available, the MAXXIS ST radial M8008 tire is by far the best. I trailer more then most around 10k miles a season. Back and forth from CT to the cape Can get 6 years or longer out of set. Load masters lasted 3 years. The Carlisle 8 ply lasted around 4 years. I have been vey satisfied with MAXXIS tires. Would never use another tire
Old 05-26-2020, 05:23 PM
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Good to2 know, thank you. This year I'll be trailering about 60 miles total, 15 miles to the launch ramp and back but will probably be doing more in years to come so will go with the D rating.
Old 05-27-2020, 03:13 PM
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I always go with the absolute highest rated tires that I can. On my 34' cabin cruiser, I have triple 8k lb axles but my wheels and tires are rated for 6,005 lbs each. So 24k lb trailer with 36k lb tires.

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