Would you add a second fuse block for unknown future additions? My truck has the original fuse block (just the basics: lights and stuff). Maybe an extra terminal block in the cab and on the firewall for any future additions so I'm not trying to hotwire things off the headlight switch (like how they did the cigarette lighter!).
More fuses won't hurt. It sort of depends on what you have. Common when the AD trucks were built were individual fuses (for things like radio, heater, etc). Not common at all were fuse blocks where additional things could be added. I'm certain you've seen these. Do you have the original wiring diagram? I might have it here somewhere. It wasn't bad work, actually but sophistication in production styles overtook it as few as 7 years later.
