Is there any way to program my truck so that Siri works at any speed?

 

Mine does. Are you using Carplay? What is the exact issue?

 

Isn't it that some features work at any speed and others don't?

That's baked into Siri at birth.

 

Once I exceed like 35 she shuts up and don’t answer

 

It will handle directions at any speed. If you ask for information on an item, place etc that requires reading it will say I can’t show this while driving.
Check settings for Hey Siri prompt and Allow Siri when phone is locked and turned on.