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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