> I think the relay vendor should have the specification about
> minimum holding voltage.

I've already found 'a' minimum hold voltage. That is, the voltage
at which the relay drops out

I guess what I'm really getting at is whether the coil is saturated
enough, relative to the 15-24V pull-in range, at the lower current/
voltage to be considered a 'solid' hold in normal use

As you suggest, the manufacturer may recommend the lower
end of the pull-in range, ie > the 13.6V hold voltage I have

I'll have to ask, but for now I'll pencil in a voltage doubler and
maybe try some amateur vibration tests, for what they're worth

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