Those 250 numbers mean exactly nothing. The trucks are identical physically if the 250 has the camper package. If it doesn't, it will be missing the single upper overload spring. However, even if it had the camper package and the spring that comes with it, it would still have the same ratings. The 250 is purposely de-rated on paper and the door sticker to fill a different market segment. Bottom line is a 250 with the camper pkg. is a SRW 350 with different emblems and a different door jamb sticker. So, if you want your 250 to be a 350, add the overload springs (if you don't have the camper pkg already) and pump your rear tires to 80 psi. Done.