When you say "Marathon B", I'm thinking you mean a Marathon tire in Load Range B. Not a good choice - they will be overloaded. You should get a Load Range C tire at a minimum - that is what TM ships on their trailers these day. As you saw in the Tire forum, some of our members have moved to a Load Range D, just to get some extra capacity.
Check out the Goodyear web site for some detailed info.
Bill
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