Based on the width of frame, section modulus, kicked up profile of the frame rails over the rear axle and the length of the springs (also number of leafs to the spring) all matching the C8A I suggest a complete C8AX frame mey have been used in order to have mounts for the cab as the C8A HU seies used different body mounting system for the one piece cab and rear body compared to the sepatate components used on most other CMPs. Another similarity to the C8A is the transfer case mounted parking brake. A)lthough it could be fitted to the C15A transfer case, I don't think it was a factory fitting. The tyre size also matches C8A, which only makes sense as the profile of the C8A rims was the tapered bead seat rather than the flat bead seat of the heavier trucks (modern tires slide onto the HUP rims easily but can be a challenge on C15A).
Interestingly, the axle ratios don't match those specified for either C8A or C15A. I don't know the ratios for the C8AX.
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