How far would I drive my original truck......anywhere I wanted to go!! I had a 50 1/2 ton and figured if I could stop and start it all around town everyday and put 100's or 1000's of miles on it in short trips it certainly could run smooth for any distance I wanted to go. Never took it on a LOOOOONG trip but many 50 to 100 miles trips regularly and it never had a problem. It was original except for the tires.
....note: after a couple years of running it HARD up and down I-85 at 55-60 mph a rod finally started "pecking". Pulled it out and put in a used 235 and kept trucking till I traded it to my brother. It was good one indeed!