While nowhere near as relaxing as ETS2, American Long Haul is probably the best way to experience SCS' older titles and what made them into the developer they are today. Sure, it has lots of quirks and no mouse steer support, but mess with the settings enough and steering with the keyboard actually isn't half bad.
First up, there is no leveling in this game - if you have the cash saved up from loads delivered, you can buy any truck and any upgrade as soon as you start. While sleeping is in the game, it's optional and the cops never go after you for driving 80+ hours straight. The cops of course are everywhere, and can detect your high speed through buildings and even terrain, so you're encouraged to not keep that hammer down. Timed loads are also out, you can do straight runs or hook up and tour the countryside before making delivery. Now, truck handling is where American Long Haul really differs, these rigs take far longer to stop, and often slide out on the icy roads present in most of the Canadian section and part of the American section of the map.
Every truck in this is based on a real one, but as usual the names weren't licensed so they're a little different than expected - for instance, Kenworth is now Kinetic. Trailers are also pretty accurate for what you'd find on this side of the pond, but their tracking angle behind the truck while on the move is a little off and takes getting used to.
Bug-wise, the game seems just fine to me, apart from the texture flickering I get on crosswalks and the occasional AI car shadow. There are a ton of collisions in this game, as that is random and keeps you on your toes, and which a few times will be the result of lousy detection by AI cars changing lanes into the side of your rig. There are a few invisible walls placed oddly too, mostly at the entrance ramps to gas stations in the Canadian portion of the map - hitting one head-on doing 80 is a bad idea, trust me.
For the $2.49 it often goes on sale for during the larger steam sales, this is well worth it if you'd like a truck sim that's actually pretty hard, and if you don't mind slightly dated graphics.
Edit: Slight update, it seems resting plays a part. Once I started using rest spots, and have been running for several game days without sleep, I was pulled over and ticketed a measly $14,200 by a cop outside Houston. GAH!