I have th c7 and Allison 3000 and similar construction in our 06 Safari, our first diesel, second class a and we love this rig. :> We stole ours, asked 90, we gave 57 in Sep2014 with a 5yr bumper-to-bumper warrenty, a repo that had been hidden for several years and sat on the lot for over a year(think it didn't sell because of the midship door, which we LOVE!) Ours had 15,000 miles but they listed it at 150,000 because they did not realize the last number was a decimal. 80 sounds good for a 10yo with 25,000 low miles. I'd definately hurry and go look for signs of good maintenance.