1st you cant export skined _cdt the game just wont load them lol
and 2nd it snt that easy Risky,
you basically dont use the <Axle/> tags you link the axle meshes to the Axle_cdt wich is coded in the <Body/> physic model mesh area, also you dont use SuspensionStrenght="" codes you use Spring="" and Damping="" in the Contraint of the Control_Axle_F_cdt and Control_Axle_Rear_cdt and then do the same "Suspension code" for the axle articulation.... its hard to make, i made 7 mods like that
Montecarlo 77 (1st Version of it it had IFS and Rear axle colisions)
Jeep Cherokee XJ
Jeep Wrangler TJ "RockForest"
Jeep Wrangler TJ RockCrawler "The Hulk"
1986 Ford F700 (Log truck, Car carrier Never Released)
Uaz 469 (For Spintires)
2006 Chevy Kodiak (Personal Build Friends Got the Stock Suspension One)
there are 2 mods like that int he worksho Zil 157k and Zil 130 but both are trail trucks too