Thanks,
I thought that more people would have had this problem by now. and BIS would have put a bug fix out.
Any way I have fixed the problem (I think), I just use a trigger for that BMP near the hole to [setpos] just past the hole, and you can hardly tell that the tank moved.....
It is a work around, but it would be nice not to have to do it, as other vehicles go down the hole too. If I drive fast enough in the sports car, it will just about jump it, and keep going, but jeeps, trucks etc; well down they go....
Regards