S12 water wagon old

not sure if this should be in the old iron or hear move if need. new to me S12 water wagon. looking for a little info on it and a place to look for name plates i thinking late 50's but it's got terxe sticker all over it but that's too new for this it's a Euclid right. i was roading it home from the sale it felt like there should be another gear in it. i was doing about 17-20 mph or is that the top speed. it's got a 4 speed manual in it right? what are the chances to find a bole to put back under this thing? or a S7 would sure be nice .
https://youtu.be/ViT-RR27lPE
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S12 water wagon old