Cat doesn't do road diesels any more. The MX-13 is a Paccar engine built for Kenworth/Peterbilt who are owned by Paccar. Anything large enough for an MX-13 will be a lot more than $80k, but still reasonable compared to a pickup. My preference is the ISX rather than the MX and, out T880s (Class 8 Kenworth) go for around $175k depending on options. Ours are spec'd with basic interiors, 48" sleepers, f/r/center lockers, and the 18 speed Ultrashift (Eaton-RoadRanger.) I try to avoid the Paccar branded parts and stick with the name brands on the major components. Lots of Petes (same company) similar priced, I just like the look of the KW. (It's like a GMC/Chevy thing.)