ok this may be an interesting question for some.
The cup holders in my VNL630 are useless as it gets. Loose, problematic and all (company truck). I have tried wedging cardboard and other products to lessen the amount of movement the cupholders have but no matter what I try you simply cannot prevent a cup of coffee from spilling while on the highway, it is even so bad it causes cans of pop to to go flat in 10 minutes.
Is there a product or something I can do to have a usable reliable cup holder? Even gyroscopic options