Trucking isn't a very common thing to see on this server, maybe because of the low profit, but the thing that annoyed me the most is the cooldown. After a 2-3min ride I had to wait 30seconds to start another one which is kind of a buzz kill and makes me not want to do another one.
Basically the suggestion would be to reduce, or ideally remove the cooldown completely between truck deliveries. I don't really consider trucking a mission, and wouldn't compare it to delivering pizza or mail. It's more of a job thing for me and I'd like to drive without having to wait.
Fishing doesn't have cooldown, this shouldn't either, especially since you don't get a lot of cash from it.