Unfortunately this one can't be converted to UCGO without a lot of work which I think would spoil the aesthetic of the model.
UCGO has a threshold for maximum vertices (15000) which is well below the number in this model. I did try to optimise it for compatibility, I even deleted the entire internal mesh and made the windows opaque to disguise the fact, but still I was very much over the vertices limit. Using optimisation tools in Gmax only resulted in a mesh that had ugly inconsistencies. When I realised I couldn't make it UCGO compatible I decided to incorporate all the wheels in the same mesh group as other body parts for the sake of framerate friendliness, further reducing UCGO compatability.
I began this mesh about three years ago, so UCGO wasn't something I designed for. Ultimately I'd like this to have a custom dll, which I'd be grateful for assistance with, but which I'll make myself otherwise (may take a long time). Contrary to the appearance of my add-ons this weekend, I favour the idea of add-ons without dependencies. Not being able to code is a limiting factor.