Here's the deal. I have an 07 Sierra Classic SLE1500 with 86000kms. I am thinking about an 05 6.6L diesel SLT but it has 225000kms. I tow a 17ft camper trailer quite a bit. I can do this exchange with almost no money out of my pocket. Should I go through with this? Is the diesel worth it? That sure is a lot of kms on the diesel.