It seems you're looking for for Euro Truck Simulator 2 (version 1.11.1 or possibly a typo for 1.51.x ?), but the phrase "solid paper" doesn't match any known mod or term in the ETS2 community.
: Added support for sway bar simulation and refined truck/trailer stability controls. Free Mods for v1.11.1 euro truck simulator 2 v 11 1 mods free
: Older truck models that were common during the game's launch, such as the Scania V8 or early Volvo models, often have specific sound and skin mods tailored for this version. It seems you're looking for for Euro Truck