Simple Caravan system, help requested, as well as opinions. (WORK IN PROGRESS)

[Arkhios]

So, I'm in middle of a design process for a caravan system. I'm trying to create a simple system for a wasteland exploring kind of campaign (the one I've been working on since I first joined the forums, actually). I'm thinking of using the caravan as the player's base of operations, so to speak, so it'll have to be light-weight system that can evolve throughout the game.

So far what I've come up with can be found here.

All help, ideas, and balancing feedback welcome.

And, obviously, ask if something isn't clear. I'll try to explain it further, as the document is basically only a bullet-point checklist for me as the DM, and I should know what I aim to use each feature for.
That, ofcourse isn't self-evident for everyone else. My apologies in advance.

[Arkhios]

So, let's say a post-apocalyptic caravan had a turbo-charged bulldozer (imagined speed somewhat equal to a bus from d20 modern) as the locomotive, how fast overland travel would be reasonable, compared to the more medieval vehicles and all depicted by the rules by default?