Chris:
I did a little research today on the Goodyear Website:
http://www.goodyear.com/rv/pdf/rv_inflation.pdf
Check out the above link!
You might want to consider going to a 14 inch tire on the 3326. The load factor by inflation of the tire increases significantly over the 13 inch tires you are running now.
I know, you would have buy new rims and all. But, this is one of the reasons TM has gone to the 14 inch tires on the new 3326 trailers.
TrailManor may be able to assist you with the problem also.
Anyway, take care and have a Happy and Safe New Year Camping with your TM.
Jeff