The Surly LHT (or Ogre, or old school MTB with a modern wheel set) might be the choice if you're really packing a LOT of weight and therefore are concerned about breaking axels and whatnot. Those bikes will be stiffer and heavier and not as much fun to ride, though. The Schwinn is the better choice if you're not getting too crazy on what you're packing.
Or you could step up to a Cannondale ST, which is both stiffer and lighter than the others.
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● 1971 Grandis SL ● 1972 Lambert Grand Prix frankenbike ● 1972 Raleigh Super Course fixie ● 1973 Nishiki Semi-Pro ● 1979 Motobecane Grand Jubile ●1980 Apollo "Legnano" ● 1984 Peugeot Vagabond ● 1985 Shogun Prairie Breaker ● 1986 Merckx Super Corsa ● 1987 Schwinn Tempo ● 1988 Schwinn Voyageur ● 1989 Bottechia Team ADR replica ● 1990 Cannondale ST600 ● 1993 Technium RT600 ● 1996 Kona Lava Dome ●