You're right, future repair costs are a factor. But if it's still running that means someone has been taking care of it. It might blow a head gasket tomorrow. But then again any truck you get could blow a head gasket tomorrow.
It's hard to estimate repair costs but I wouldn't be surprised if a brake job cost you anywhere between $800 and $1800 from a dealership. Regardless of what you buy, finding a good independent mechanic would save you money in the long run.
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