These photos appeared in the 2008 book HEMET, part of which was scanned into Google Books. In this case, the captions suggest that these were photos of the first cavalcade (listed in the caption as ’48, but ’49 according to a long-time club member),
To me it looks as if there’s at least two M-38A1s, but I can’t confirm that with this lo-res image. The year credited is 1954.
The caption on the photo below suggests this was taken in 1948, but the CJ-3A shown at the front places the next two photos later than that. In fact, the CJ-3A pictured appears also appears in the 1949 photos from Life Magazine. So, these were most likely taken in April of 1949.
An M-38A1 (or CJ-5) can be seen in the background, suggesting this is at least 1952 or later.