just wondering if snow chains have to be the specific size for tires and if you need them for the trailer as well? i have a set for 33's but my tire size on my f250 is somewhere around 31.8" (265/75/16). on the box i had i could'nt find a size lower than (275/75/16), or 32's. just wondering if they work or if i have to pick up another set. not sure what size tires are on the trailer.... currious cuz i'll be in tow over the I-5 passes headed to WA at the end of the month and it was already snowing in Yreka a couple of weeks ago.