i use my truck for working like a k30 was made for . plow snow / trailer pulling and daily driving all mixed in . i have a aux spin on with temp sender for gauge in there and the mid 60k mile orignal gm th400 has super clean fluid and no problems . i do need a aux cooler at some point for the long hills and trailer duty use . otherwise plow in low range and she is good with the oem rad cooler all the time .