Do any of you have any experience with medium duty trucks? I am giving up my goal of an old dodge hauler, mainly because I can't find an older crew cab.

So this weekend I am going to take a look at 3 trucks, I have done some research but you always just seem to find the bad/terrible.

The trucks I am looking at are:

Freightliner - 8.3 cummins(manual pump) eaton 9 speed
International - DT466 6 speed manual
Freightliner - 3126 Cat 6 speed manual

All of them have the GCVW I need and crew cabs, just not sure about the engine combo's and what is the most reliable.