ATS 1.44 mods

Kenworth c500 update to 1.44 fixed bugs Credits: ReneNate

Kenworth w900a updated to 1.44 some bugs fixes Credits: ReneNate

Kenworth t600/t660 update to 1.44 some bug fixes Credits: ReneNate

Kenworth 521 updated to 1.44 some bugs fixes Credits: ReneNate

Mack superliner custom updated to 1.44 some bug fixes Credits: ReneNate