I read alot if different boating and fishing sites and the discussion on Marathon trailer tires comes up quite freqentely and I always find them interesting. There never seems to be a middle ground on them and guys are either very happy with them or think their nothing but garbage. Some guys say they've run them for years with zero problems and other guys are having them blow apart almost right away. They used to be made in the USA and are now from China but there's still alot of differing opinions.
My current boat came on an EZ Loader with Marathons made in China and I towed it for 2 years and never had an issue. I got a new tandem axle trailer last year and those tire are also Chinese made Marathons and after one season I'm happy with them....so far anyhoo.
Carliles are another tire that get mixed reviews and again guys either love them or hate them.
I had Carliles on a Yacht Club trailer I got new in '99 and was very happy with them. I never keep tires longer than 4 or 5 years and changed those ones for more Carliles and again was happy with them.
I'm very fussy with tire maintanance whether it's on my trailers or trucks and rotate them regularily, inspect them alot and check the air pressure before EVERY trip, even short ones which IMHO is the #1 thing for keeping tires safe.
Poorly maintained tires are probably the biggest reason for tire failier but far too many guys don't seem to realise that.
Of course thats just my opinion for what it's worth.