38 1.5 ton Do your tires say "nylon" on the side,if so may be humping till they warm up. Big loaded trucks setting overnite will hump pretty bad especially in cold weather. Our old trucks that set around a lot will do it,it's why you need to drive every day LOL ! Daily cruzer is best coffee shop run,donut shop,gas station,go to work,you know any reason to cruise !!
