Speaking of older games and tank trailers... That
Hard Truck 2 I mentioned earlier had a manual, promo video and even a short introduction clip (cut in
GOG version), where the driver picks up a guy who tells about the game world. So, all these materials at least once mention that (explosive!) fuel transporting is a well-paid job...
which isn’t true in the actual game 
. The money-per-distance ratio is average or even below average, the load is too small, and most of deliveries have a target far from other fuel depots, so sometimes you will make more empty rides than cargo deliveries. In addition, the info booths which can give you information about what orders are on the nearest base (and how many minutes they last), don’t say anything about fuel depots, so the only way to find out where will be your target is to get into the depot. Nothing of those inconveniences worth the money you get for the job, plus, the tank trailer has the worst stability. Although there is one fun moment: if your cargo has exploded, you still can quickly call 911 who takes out the fire and lets you continue to deliver the remains of your fuel

. Unlike
*TS,,
HT2 economy system allows to damage a big part of the cargo, and the fine for damaged goods is very low, so, even when 25-30% of the initial cargo is left untouched, you still have good chances to have a positive income.