Nokian is a VERY good tire.. who knows more about harsh environments than Finland..
i use their Hakkapeliittas for snow and ice travel here at 9400ft..
--and Capri is very correct: OEM that get shipped with vehicles are the minimum in every standard.. if setting side by side to the same exact brand/model/size tire, and the one on the new car is completely different..
if you are mostly hauling that 6000lb (dry weight, or loaded) trailer; with payload in bed, more than unhitched driving, you might consider jumping up to a load range E/ 10-ply tire.. will hold up to 80psi, and probably carry that weight to at least a 40k mile mark range (i usually get about 60k on load range D or E, but i do NOT carry close to that weight in bed & trailer); however, you will suffer somewhat on mpg..