Trailer tires are sized for the load their trailer is rated for. If
the tires are small, so is the maximum load on the trailer.

I've two trailers. One has 13" steel wheels, and the other 15" alloys.
The tires are trailer specific tires 185/80 13, and 205/75R15.

With that said, if you cared to research this, you will also find out
that trailers are mandated to have tires rated for trailer use, and
those ratings are different than tires used by cars. In fact, many
trailers actually have bias ply tires, not radial tires. Yes, there
are tires that are SPECIFICALLY rated for use ONLY on trailers (use on
vehicles is prohibited).

On May 26, 2008, at 11:18 PM, joel walker wrote:
>
> which brings up a question i've had for a looong time:
>
> why are small trailer and camper trailer tires soooo small??!!
> even the boat trailers (which are almost as common in these parts as
> pickup trucks!) have tiny tires!
>
> cause they are cheap?? but they are important ... why can't they be
> the same size as car tires?? at least 13 or 14 inch rims??
>
> anybody seen any trailers with larger tires?