You can subscribe to SiSL's Mega Pack at Steam Workshop and no need to worry about updates anymore. It will automatically download within your Steam. You just need to add it to your active mods
REQUIRES: SiSL's Mega Pack 2.x
This file can help you for customization on the customizable marked items. This is basic file, contains only basics. You can browse your country specific items or other premade goodies at Github here
Installation: Just place ZIP (Do not extract it) to your casual mod folder in your Documents / Euro Truck Simulator 2 / mod folder and place it in your active mod list, Order is important. Place it ABOVE SiSL's Mega Pack.