Buying older ISX truck for cash vs "fleet maintained" newer ISX

[arch_stanton]

I look at it this way.I can't afford to pay a shop 125$ hr while I lose 100 an hour to do a 4 hour repair, and whats worse is the 2 day's of down time waiting for them to have time to make the repair.So in my hypothetical repair I will lose 3 days or 2250$ in revenue and that is what I average long term and then I pay them 500 $ and you lean nothing and the next time you need the same repair you still don't know how to do it.
I make more repairing my trucks than driving them.