Car Tires ok?

[JimS123]

Well, it is not the Smartest thing to do, and if the Trailer, even the Tow Vehicle are involved in even the most minor of Accidents, and some sharp Oily Hided Lawyer takes notice of Non-Trailer Tires on the Trailer, Look out! Odds are the court would find the Trailer unroadworthy, and because it was on the Road, can put a lot of Liability on you.

As I said above, a new trailer came from the factory with car tires. I guess the lawyer could then sue the trailer company.

Regardless, when those tires wore out i DID replace them with STs, and after that the thing rode like crap.

Maybe LTs are the best compromise, at the proper weight rating of course.

 

[jhande]

The only way you could safely use P rated tires is if you know exactly what your boat & trailer weighs and can fit a tire that is not going to be overloaded. The reality is that most trailers have at best a 10% safety margin with trailer tires that will always have a much higher weight rating than a P or LT tire will of the same size. So if your load is at the limit using P tires of the same size will put you well over the limit.
It is really the fault of trailer manufacturers. 15” rims and tires limit you to a 225/75-15 load range E tire at 2830 lbs. No P tire or even LT tire in that size will match that capacity. Now if you upgraded your axles & hubs to 6 lug 16” wheels then yes you’d have more choices.

ST Load Range E is rated at 2,830 pounds at 80 psi x 4 = 11,302 pounds.
LT Load Range E is rated at 3,195 pounds at 80 psi x 4 = 12,780 pounds.
But each make and model can vary regarding MAX weight and air pressure.

 

[jimmbo]

My Trailer rides and tracks very nice with the Trailer Tires. Trailer came with Goodyear Marathons, and when one blew out on the Highway at 110km/hr at 12 yrs of age

I replaced them with a pair Goodyear Endurance. Not the Cheapest Option, but...

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[Lou C]

ST Load Range E is rated at 2,830 pounds at 80 psi x 4 = 11,302 pounds.
LT Load Range E is rated at 3,195 pounds at 80 psi x 4 = 12,780 pounds.
But each make and model can vary regarding MAX weight and air pressure.

What I meant was no P or LT tire of the 225/75-15 size will match the 2830 lbs of a trailer tire of the same size. This is important because that is the biggest size you can fit to most boat trailers.
Like I said if you go up to a 16” rim on a 6 lug hub you have more options. But, you need a 2x3 axle, #42 spindles and 6,000 lb hubs to make that happen. A lot of extra cost. So if your trailer came with 15” rims the cheapest option is the best E rated trailer tires you can find.
And actually there are very few tires in that size any longer you’d have to go to a 235/75-15, which would just fit under the standard fenders. These in LT specs are usually load range C rated at 1985 lbs @ 50 psi. Almost 1,000 lbs less than an E load range trailer tire in the 225/75-15 size