I appreciate your response. What do you suggest of exactly how I may resolve this problem since this is the only scenery that present this problem. I do want to continue using my FollowMe and other vehicles. Please help . . .
It's the only scenery that has the problem, because it's the only scenery in FSX which is fully 3d, which allows for the elevated taxiways.
There's no way we can "fix" this from the scenery, which is correct, since it works fine with the user airplane, the ai airplanes and the ai ground vehicles: it's the models you are using that needs to be fixed, but I don't have any idea how, it depends what the authors made to their parameters. It might be related to the contact points in their sim.cfg, you can try to lower them a bit, but it's tricky, because the vehicle might lose balance if you do it wrong.