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I seem to recall that the 3326 was a two-axle 4-tire trailer equipped with 14-inch Goodyear Marathons. Assuming that you have size 215/75R14 (and not 205's), each of those those tires is rated to carry 1870 pounds, so on a 4-tire trailer, the tires are rated for a total of 7480 pounds. This is a very generous total, so I don't think you need to do anything other than replace the tires with the same Goodyear Marathons.
As a quick note, it appears that 14-inch Marathons came in both a 205/75R14 and a 215/75R14 size. There is a small difference in load-carrying capacity, but these tires apparently fit on wheels with a different size. So when you replace your tires, you should duplicate the size you already have.
You may have been reading about TM owners upgrading from 14-inch tires to 15-inch tires. All TMs other than the 3326 are single axle trailers, so the two tires together were rated 3740 pounds. This is uncomfortably close to the actual loaded weight of the trailer, so there were more tire failures than there should have been. Retrofitting these tires with 15-inch version was an easy way to increase the load carrying rating. Since you have four tires, you need not do so.
Hope this helps.
Bill
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Recently there was a "Poll" taken on the subject of tire blow-outs that had good information about types of blow-outs on the various TM's, but as quoted above, the TM 3326 has 2 axles with a total of 4 tires over which to distribute the load which makes the 3326 unique.
I am curious if any 3326er has had a non-road-hazard related flat tire and if any serious damage occurred. Just theorizing but it seems to me that the risks of a flat tire, though NOT entirely eliminated, would be greatly reduced with the two axles and also that the presence of a second tire right next to the flattening one would reduce the risks of debris hitting the plumbing.
Question: Has any 3326er had a non-hazard related flat and was there plumbing damage resulting from it?