HUPs did not have a pintle
As far as I can find HUPs were not intended to have a pintle. Having said that I've seen many photos of HUPs with trailers generally of the 1/4 ton size. I think Bart Vanderveen’s HUP had one. From the pictures, it looks like the common Jeep pintle was often fitted though this would require reinforcing the rear frame member. According to the service bulletins, they had to reinforce the tow rings 2" holes in the frame rail ends because they tore out.
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