This suggestion wouldn't necessary make deliveries physically faster but it would make delivery orders more efficient and any other consumer communication. Use your radio and set one frequency, one you would advert where people can tune in and make an order - items and the location, you would give them the price on the radio and they could pay you up-front or come to one of your offices to make the payment. In addition, you could even have more than one frequency being in use within the caravan. One for guards, traders, high officials and Customer Inquiries etc. and you could include more public channels for people to use or use PM. I would refer to using this than PM because talking on a specific frequency would assure more fluidity and message retrieval speed would be considerably quicker because typing has character limits.
Most likely have people monitor them like a receptionist and stay at the base as guard or someone who is a driver or something. If I some how am able to get it you'll be second highest since you seem like a good guy and know what you are talking about.
$750?! For a custom faction ? You sure you're correct? Jesus Christ, yeah that's the smart choice to make I would never in a million years pay that much for something 'custom' on a gmod server; even a entire faction isn't worth that much. (Not ripping on the server prices, I'd imagine it's to deter the server from being full of custom factions and creating anarchy; but still 750 is way too steep, IMO even 100-200 is pushing it for content that isn't even that hard to add/make) PS: I'm not denouncing the people who have or are going to, it's your money and what I see as a waste may not be in someone else's perspective but personally I wouldn't do that.