This is completely new mod, keep in mind that older rigid addons plus other addons wont work with new mod. Before updating, i recommend change chassis to regular semis (to keep the odo kms) or sell trucks. With new mod, there is BASE mod and truck addons. Just download base mod and addons for truck you like to have new chassis. Mod adds. Chassis: 4xx 5700mm 6xx 3900mm 4300mm 4700mm 8xx 4100mm Body Brands: Ekeri Knapen Närko NTM Toplift VAK Parts from: Zepro Moffett Autoline Slirej VBG TAV