Need advice for switching a engine in 07 Freightliner Columbia

I have driven a few company trucks with mbe in my opinion once they start having problems they usually come with more to follow. If your looking for a columbia model look into a old walmart truck. I drove one in the oilfields for a owner and it had over a million miles when i left and still had a good purr. I believe they told me when they bought it it was only 12k. And it had an apu. Most problems we had was wheel seals and a power divider. But like i said it was in the oilfields.