I bought one of these $10-15k trucks. The seller lied his @$$ off about the truck. It cost another $10k to get it into a fair condition. The a/c control box had to be replaced, $1k, the computer also, another $1k. The freightliner shop did a, so called free VIZ check. They found kigpin problem, tie-rod problem, on and on. I had them do a dyno for $250, I have 82% power to the ground this is ok. Paid for the ECM report, which they couldn't read. I asked them to steam clean or de-grease the engine & drive train in order look for leaks. They didn't do it. And I had it at the shop for months, too. So time was not a problem. After all this work they still failed to examine the truck for leaks. I have a slight oil leak on drivers side, towards the front of the head between block & head. I have it on the road and its doing ok, actually pretty good. If I would have bought a more expensive truck it could have still cost me the same amount of money to fix.
The best deal I found was a FL Classic a shop was selling because the owner couldn't pay for the rebuilt engine. The truck was in great condition, new paint, etc.. I couldn't believe the deal, & I failed to act, it was sold before I could drive the 250 miles to look at it. I saw it on Craigslist. I saw another good clean FL Classic on CList also, for 15k. I just didn't act, the economy was bad, & I was really looking for an Aero truck anyway. This said, I would look in craigslist. You have to look day after day after day. Or you could loose out like I did. I get 6.2 to 6.5. I put super singles on about two wks ago. I think I'm get 6.97 now. I'll have keep checking this out to verify.