I have a fl60 with the ISB Cummins/ 6 speed, and I have no problem with power. I have been told the computer can be upgraded for more power. You might see if the CAT can be upgraded from someone who knows.
The FLs ride better than most class 6, but they are loud .... and the CATs are very loud. If you end up with an FL, contact me and I will give you some tips on what worked and didn't work on mine.
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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