Are ALL the marathons now built in China?? We've always had GY marathons, and never any problems going around the country 3x + Alaska BUT we have a TPMS on all our trailer tires AND we have had each tire individually weighed (at Rallys) and I check PSI (via TPMS system) prior to driving every driving day.
On our trailer below, 3 of my tires wore excessively on the inside on our first around the USA trip. Consensus was the axles were bowing even though we were just at the GAWR, and we had the axles upgraded from 3500# to 5000# and now the new tires are wearing much more evenly.
