Below solution apply to KP-1~4. Just make sure your front wheels are not angle. Please list your mods use...I have try to load your craft file...about 2 hrs trying to figure out what mods did you install.... for KP 5. Just make sure your side wheels are 'straight', when your craft hit the ground. Normally, The middle section of your craft will be pull down-worth by gravity. Hence, creating angled wheels. Including fixed craft file for KP 5. Download here.