Have you looked in the Promaster owners manual?
A Google search shows that this is set by the OEM Uconnect radio. However, people that changed out that stock radio for another brand lost that functionality. If your Travato has a different infotainment system installed then that might be a problem.
In reading online it seems that there are some aftermarket “radios” that retain the ability to change the dash clock and others that do not.
I suggest you do two things, maybe three… call Winnebago Customer Service, visit some RAM Promaster forums to ask there and third maybe go by a Ram service center???
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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