Matt, if by used you are looking at a factory converted '04, the best and most common combination is the Freightliner Columbia with Mercedes 450HP and the Freedom Trans. Anything '03 or a couple years older that was commercially built will most likely be built on a Freightliner FL112 chassis with 430HP Cat and Autoshift or FL70 chassis with Allison Auto and Cat 300HP. These combinations can be worked on at any Freightliner dealer (many 24/7 svc depts) or heavy truck repair shop. Stick with the big power if you are concerned with pulling your trailer up hills, resale will be better also.
Bob
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'18 Renegade 45'
Volvo Twin Screw, 500 hp I-Shift 12 Speed
30' Renegade Stacker Trailer
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