vehicle again !! help

i'm still trying to built a vehicle, but i have some large problems:
first:
my collision object (wheel) isnt placed like i want to, see the image



second:
my object (object mass=80.0, wheel mass=10.0) bounces a lot, which parameters should i change:

Ogre::Real susShock = 80.0;
Ogre::Real susSpring = 200.0;
Ogre::Real susLength = 20;

i tryed but nothing works

third:
could someone explain how the destructor of Demo05_SimpleVehicle from OgreNewt works, plz give good explanation

the first problem is solved, but someone must know an answer to the second and third problem